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Herculaneum papyri

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Photos of the papyrus fragments PHerc.1103 (a) and PHerc.110 (b,c). Image contrast and brightness were enhanced to better visualize the details visible to the naked eye on their external surface.[1]

The Herculaneum papyri are more than 1,800 papyrus scrolls discovered in the 18th century in the Villa of the Papyri in Herculaneum. They had been carbonized when the villa was engulfed by the eruption of Mount Vesuvius in 79 AD.

The papyri, containing a number of Greek philosophical texts, come from the only surviving library from antiquity that exists in its entirety.[2] However, reading the scrolls is extremely difficult, and can risk destroying them. The evolution of techniques to do this continues.

The majority of classical texts referred to by other classical authors are lost, and there is hope that the continuing work on the library scrolls will discover some of these. For example, as many as 44 works discovered were written by the 1st-century BC Epicurean philosopher and poet Philodemus, a resident of Herculaneum, who possibly formed the library, or whose library was incorporated in it.

Discovery

[edit]
Dionysus, Plato, or Poseidon sculpture excavated at the Villa of the Papyri
A map of the Villa of the Papyri

Due to the eruption of Mount Vesuvius in 79 AD, bundles of scrolls were carbonized by the intense heat of the pyroclastic flows.[3] This intense parching took place over an extremely short period of time, in a room deprived of oxygen, resulting in the scrolls' carbonization into compact and highly fragile blocks.[2] They were then preserved by the layers of cement-like rock.[3]

In 1752, workmen of the Bourbon royal family accidentally discovered what is now known as the Villa of the Papyri.[2][4] There may still be a lower section of the Villa's collection that remains buried.[3]

Ethel Ross Barker noted in her 1908 Buried Herculaneum:[5]

Appearance of the rolls. — A large number of papyri, after being buried eighteen centuries, have been found in the Villa named after them. In appearance the rolls resembled lumps of charcoal; and many were thrown away as such. Some were much lighter in colour. Finally, a faint trace of letters was seen on one of the blackened masses, which was found to be a roll of papyrus, disintegrated by decay and damp, full of holes, cut, crushed, and crumpled. The papyri were found at a depth of about 120 feet (37 metres).

The woodwork of some of the presses that had contained them dropped to dust on exposure and many rolls were found lying about loosely. Others were still on the shelves. Locality of the discovery. — They were found in four places on four occasions. The first were found in the autumn of 1752, fourteen years after the first discovery of Herculaneum, in and near the tablinum, and only numbered some 21 volumes and fragments, contained in two wooden cases. In the spring of 1753, 11 papyri were found in a room just south of the tablinum, and in the summer of the same year, 250 were found in a room to the north. In the spring and summer of the following year, 337 Greek papyri and 18 Latin papyri were found in the Library. Nothing of any importance was discovered after this date.

The numbers given here exclude mere fragments. Including every tiny fragment found, the catalogues give 1756 manuscripts discovered up to 1855, while subsequent discoveries bring the total up to 1806. Of these, 341 were found almost entire, 500 were merely charred fragments, and the remaining 965 were in every intermediate state of disintegration.

Treatment of the rolls. — No one knew how to deal with such strange material. Weber, the engineer, and Paderni, the keeper of the Museum at Portici, were not experts in palaeography and philology, which sciences were, indeed, almost in their infancy one hundred and fifty years ago. There were no official publications concerning the papyri till forty years after their discovery, and our information is of necessity incomplete, inexact and contradictory.

Father Antonio Piaggio's machine. — Through this inevitable ignorance of the time, a larger number of the rolls were destroyed than the difficulties of the case necessitated. Many had been thrown away as mere charcoal; some were destroyed in extracting them from the lava in which they were embedded. In the attempt to discover their contents, several were split in two longitudinally. Finally, that ingenious Italian monk. Father Piaggio, invented a very simple machine for unrolling the manuscripts by means of silk threads attached to the edge of the papyrus. Of course this method destroyed the beginning of all the papyri, sometimes the end could not be found, and the papyri were in a terrible state of decay.

Excavations

[edit]

Anybody who focuses on the ancient world is always going to be excited to get even one paragraph, one chapter, more... The prospect of getting hundreds of books more is staggering.

— Roger Macfarlane[3]

In the 18th century, the first digs began. The excavation appeared closer to mining projects, as mineshafts were dug, and horizontal subterranean galleries were installed. Workers would place objects in baskets and send them back up.[2]

With the backing of Charles VII of Naples (1716–1788), Roque Joaquín de Alcubierre headed the systematic excavation of Herculaneum with Karl Jakob Weber.[6]

Barker noted in her 1908 Buried Herculaneum, "By the orders of Francis I land was purchased, and in 1828 excavations were begun in two parts 150 feet [46 m] apart, under the direction of the architect. Carlo Bonucci. In the year 1868 still further purchases of land were made, and excavations were carried on in an eastward direction till 1875. The total area now open measures 300 by 150 perches (1510 by 756 meters). The limits of the excavations to the north and east respectively are the modern streets of Vico di Mare and Vico Ferrara. It is here only that any portion of ancient Herculaneum may be seen in the open day."[5]

It is uncertain how many papyri were originally found as many of the scrolls were destroyed by workmen or when scholars extracted them from the volcanic tuff.[7]

The official list amounts to 1,814 rolls and fragments, of which 1,756 had been discovered by 1855. In the 90s it was reported that the inventory now comprises 1,826 papyri,[8] with more than 340 are almost complete, about 970 are partly decayed and partly decipherable, and more than 500 are merely charred fragments.[4]

In a 2016 open letter, academics asked the Italian authorities to consider new excavations, since it is assumed that many more papyri may be buried at the site. Authors argue that "the volcano may erupt again and put the villa effectively beyond reach" and "Posterity will not forgive us if we squander this chance. The excavation must proceed."[9]

In April 2024, a papyrologist at the University of Pisa found information about Plato's burial place in the Herculaneum papyri by the usage of infrared and X-ray scanners.[10]

Post-excavation history

[edit]

In 1802, King Ferdinand IV of Naples offered six rolls to Napoleon Bonaparte in a diplomatic move. In 1803, along with other treasures, the scrolls were transported by Francesco Carelli. Upon receiving the gift, Bonaparte then gave the scrolls to Institut de France under charge of Gaspard Monge and Vivant Denon.[2]

In 1810, eighteen unrolled papyri were given to George IV, four of which he presented to the Bodleian Library; the rest are now mainly in the British Library.[4]

Unrolling

[edit]
Carbonized paper, found with other images in an 1858 published book by Giacomo Castrucci[11]

Since their discovery, previous attempts used rose water, liquid mercury, vegetable gas, sulfuric compounds, papyrus juice, or a mixture of ethanol, glycerin, and warm water, in hopes to make scrolls readable.[12] According to Antonio de Simone and Richard Janko, at first the papyri were mistaken for carbonized tree branches, some perhaps even thrown away or burnt to make heat.[13]

What we see is that the ink, which was essentially carbon based, is not very different from the carbonised papyrus.

— Dr. Vito Mocella[14]

Opening a scroll would often damage or destroy the scroll completely. If a scroll had been successfully opened, the original ink – exposed to air – would begin to fade. In addition, this form of unrolling often would leave pages stuck together, omitting or destroying additional information.[3]

With X-ray micro-computed tomography (micro-CT), no ink can be seen, as carbon-based ink is not visible on carbonized papyrus.[3]

Physical unrolling

[edit]

Early attempts

[edit]
Abbot Piaggio's machine was used to unroll scrolls as early as 1756 in the Vatican Library.

Following the discovery of the Herculaneum papyri in 1752, per the advice from Bernardo Tanucci, King Charles VII of Naples established a commission to study them.[15]

Possibly the first attempts to read the scrolls were done by the artist Camillo Paderni who was in charge of recovered items. Paderni used the method of slicing scrolls in half, copying readable text, by removing papyri layers. This transcription procedure was used for hundreds of scrolls, and in the process destroyed them.[16]

In 1756, Abbot Piaggio, conserver of ancient manuscripts in the Vatican Library, used a machine he also invented,[11] to unroll the first scroll, which took four years (millimeters per day).[17][13] The results were then copied (since the writing disappeared: see above), reviewed by Hellenist academics, and then corrected once more, if necessary, by the unrolling/copying team.[2]

In 1802, King Ferdinand IV of Naples appointed Rev. John Hayter to assist the process.[2]

From 1802 to 1806, Hayter unrolled and partly deciphered some 200 papyri.[4] These copies are held in the Bodleian Library, where they are known as the "Oxford Facsimiles of the Herculaneum Papyri".[2]

In January 1816, Pierre-Claude Molard and Raoul Rochette led an attempt to unroll one papyrus with a replica of Abbot Piaggio's machine. However, the entire scroll was destroyed without any information being obtained.[2]

From 1819 until 1820, Humphry Davy was commissioned by the prince regent George IV to work on the Herculaneum papyri. Although it is considered that he had only limited success, Davy's chemical method, which used chlorine, managed to partially unroll 23 manuscripts.[18]

In 1877, a papyrus was taken to a laboratory in the Louvre. An attempt to unravel it was made with a "small mill", but it was unsuccessful and was partially destroyed, leaving only a quarter intact.[2]

By the middle of the 20th century, only 585 rolls or fragments had been completely unrolled, and 209 unrolled in part. Of the unrolled papyri, about 200 had been deciphered and published, and about 150 only deciphered.[4]

Heruclaneum Papyrus 1521, British Library. The seven fragments, recovered and published in Piaggio’s workshop in Italy, were part of a gift containing a number of scrolls that King Ferdinand IV of Naples had sent to George IV of Britain in exchange for a royal giraffe for his private zoo. The scroll contains a portion of a work by the ancient Greek philosopher Epicurus (341–270 BCE).[19]

Modern attempts

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Herculaneum papyrus 1425 (De poem), drawn by Giuseppe Casanova, c. 1807
A copy of identifiable text of papyrus 152–157

The bulk of the preserved manuscripts are housed in the Office of Herculaneum papyri in National Library of Naples.[20]

In 1969, Marcello Gigante founded the creation of the International Center for the Study of the Herculaneum Papyri (Centro Internazionale per lo Studio dei Papiri Ercolanesi; CISPE).[21] With the intention of working toward the resumption of the excavation of the Villa of the Papyri, and promoting the renewal of studies of the Herculaneum texts, the institution began a new method of unrolling. Using the 'Oslo' peeling method, the CISPE team separated individual layers of the papyri. One of the scrolls exploded into 300 parts, and another did similarly but to a lesser extent.[2]

Since 1999, the unrolled papyri have been digitized at the Brigham Young University by applying multi-spectral imaging (MSI). International experts and prominent scholars participated in the project. On 4 June 2011 it was announced the task of digitizing 1,600 Herculaneum papyri had been completed.[22][23] MSI helps spot ink because the ink and the charred papyrus have different reflectivities in the 950 nm infrared band. The images are not actually "multispectral", but consist only of data in this 950-nm band.[24]

In 2019, a multinational European team reported that SWIR HSI (shortwave-infrared hyperspectral imaging), which combines several bands in the 1000-2500 nm range, detects ink on unrolled papyri better than the 950 nm technique does.[24]

Virtual unrolling

[edit]

Several research groups proposed to unroll the scrolls virtually, using X-ray phase-contrast tomography (XPCT, "phase-contrast CT"), possibly with a synchrotron light source. Proposed method has three steps: volumetric scanning, segmentation, layered texture generation and restoration.[25][26][27][3][28]

Since 2007, a team working with Institut de Papyrologie and a group of scientists from Kentucky have been using X-rays and nuclear magnetic resonance to analyze the artifacts.[2]

In 2009, the Institut de France in conjunction with the French National Centre for Scientific Research imaged two intact Herculaneum papyri using X-ray micro-computed tomography (micro-CT) to reveal the interior structures of the scrolls.[29][30] The team heading the project estimated that if the scrolls were fully unwound they would be between 11 and 15 metres (36 and 49 ft) long.[3] The internal structure of the rolls was revealed to be extremely compact and convoluted, defeating the automatic unwrapping computer algorithms which the team had developed. Unfortunately, no ink could be seen on the small samples imaged, because carbon-based inks are not visible on the carbonized scrolls.[3] However, some scrolls were written with ink containing lead.[31]

In September 2016, Brent Seales, a computer scientist at the University of Kentucky, successfully used virtual unrolling to read the text of a charred parchment from Israel, the En-Gedi Scroll.[32][33]

Process

[edit]

The virtual unwrapping process begins with using a volumetric scan to scan the damaged scroll. These scans are non-invasive, and generate a 3D mapping which differentiates between the ink and the paper. The virtual unwrapping process is independent of which type of volumetric scan is used, which allows scientists to test out different scanning methods to find which distinguishes ink from paper best and which easily accommodates scanning upgrades. The only data needed for the virtual unwrapping process is this volumetric scan, so after this point the scroll is safely returned to the archive. In the case of the Herculaneum papyri, the volumetric scan used phase-contrast CT.[25]

This method of volumetric scanning was chosen because Herculaneum papyri have carbon-based ink, which will have the same material characteristics as the carbon-based papyrus. This makes it difficult to image using many of the traditional imaging techniques, which often use differences in the light absorption/emission characteristics of different materials to create these volumetric scans. XPCT, on the other hand, examines the phase of X-ray radiation after it emerges from the scroll to determine its composition. Because the ink is raised relative to the papyrus, the radiation will be traveling in the material of the scroll slightly longer when it passes through a spot with ink than when it passes through a spot with a blank space.[34]

This means that when the radiation emerges from the paper, its phase will be slightly different than that of the empty space, allowing researchers to distinguish ink-covered spots from blank spots.[35] While this technique does allow researchers to visualize places with ink, it is much less clear than techniques such as CT scans which distinguish between different materials because slight changes (thinner ink, thicker papyrus, folds in the papyrus) all contribute to noise in the volumetric scan.

The volumetric scan is used to associate the composition of the scroll with corresponding positions, called voxels or volume-pixels. The goal of the virtual unwrapping process is to determine the layered structure of the scroll and try to peel back each layer while keeping track of which voxel. By transforming the voxels from a 3D volumetric scan to a 2D image, the writing on this inside can be revealed. This process happens in three steps: segmentation, texturing and flattening.

The first stage of the virtual unwrapping process, segmentation, involves identifying geometric models for the structures within the virtual scan of the scroll. Because of the extensive damage, the parchment has become deformed and no longer has a clearly cylindrical geometry. Instead, some portions may look planar, some conical, some triangular, etc.[36] Therefore, the most efficient way to assign a geometry to the layer is to do so in a piecewise fashion. Rather than modeling the complex geometry of the entire layer of the scroll, the piecewise model breaks each layer into more regular shapes that are easy to work with. This makes it easy to virtually lift off each piece of the layer one at a time. Because each voxel is ordered, peeling off each layer will preserve the continuity of the scroll structure.[25]

The second stage, texturing, focuses on identifying intensity values that correspond with each voxel using texture mapping. From the volumetric scan, each voxel has a corresponding composition. After virtually peeling off the layers during the segmentation process, the texturing step matches the voxels of each geometric piece to their corresponding compositions so that an observer is able to see the text written on each piece. In ideal cases, the scanned volume will match perfectly with the surface of each geometric piece and yield perfectly rendered text, but there are often small errors in the segmentation process that generate noise in the texturing process.[25] Because of this, the texturing process usually includes nearest-neighbor interpolation texture filtering to reduce the noise and sharpen the lettering.

After segmentation and texturing, each piece of the virtually deconstructed scroll is ordered and has its corresponding text visualized on its surface. This is, in practice, enough to 'read' the inside of the scroll, but it is often best to convert this to a 2D flat image to demonstrate what the scroll's parchment would have looked like if they could physically unravel without damage. This requires the virtual unwrapping process to include a step that converts the curved 3D geometric pieces into flat 2D planes.[25]

After segmenting, textualizing, and flattening the scroll to obtain 2D text fragments, the last step is a merge step meant to reconcile each individual segment to visualize the unwrapped parchment as a whole. This involves two parts: texture merging and mesh merging. Texture merging aligns the textures from each segment to create a composite. This process gives feedback on the quality of the segmentation and alignment of each piece.[25] Mesh merging is more precise and is the final step in visualizing the unwrapped scroll. This type of merging recombines each point on the surface of each segment with the corresponding point on its neighbor segment to remove the distortions due to individual flattening. This step also re-flattens and re-textures the image to create the final visualization of the unwrapped scroll.

These techniques, while successful at isolating the layers of the papyri, had difficulty detecting text clearly due to the complex geometry of the sheets, such as the criss-cross structure of the papyrus fibres and the sheets, pleats, holes, tears, and contamination from the extensive damage. One potential source of error might be the 3D volumetric scan itself or the flattening procedure used to read it since the algorithms are not able to perfectly prevent distortions in the reading of these papyri. [25]

Seales presented in 2018 readability of parts of a Herculaneum papyri (P.Herc. 118) from the Bodleian Libraries, at Oxford University, which was given by King Ferdinand of Naples to the Prince of Wales in 1810. The imaging method Seales used involved a hand-held 3-D scanner called an Artec Space Spider.[16] The same year he demonstrated readability success of another Herculaneum scroll, with help of the particle accelerator Diamond Light Source, through a powerful X-ray imaging technique, letter ink which contains trace amounts of lead was detected.[16] Prior to this he demonstrated successful virtual unrolling without detecting ink on Herculaneum scrolls.[37]

Vesuvius Challenge

[edit]

In 2023, Nat Friedman, Daniel Gross, and computer scientist Brent Seales announced the Vesuvius Challenge, a competition to "decipher Herculaneum scrolls using 3D X-ray software".[38][39] The Vesuvius Challenge offered a $700,000 grand prize to be awarded to the first team that could extract four passages of text from two intact scrolls using 3D X-ray scans.[40][41]

On 12 October 2023, the project awarded $40,000 to Luke Farritor, a 21-year-old computer student at the University of Nebraska, for successfully detecting the first word in an unopened scroll: porphyras (Ancient Greek: ΠΟΡΦΥΡΑϹ, lit. 'purple').[42][43][44] With this milestone "first word" award included, the project has awarded $260,000 in total for segmentation tooling and ink detection (from segmented volumes).[45]

On 5 February 2024, the project awarded its 2023 Grand Prize of $700,000 to the winning team and $50,000 each to three runner-up teams for successfully revealing 5% of one scroll, and announced its goal for 2024 of revealing 90% of the four scrolls that it has fully scanned.[46] The uncovered text is believed to be a previously unknown text of Philodemus, "centered on the pleasures of music and food and their effects on the senses".[47]

Significance

[edit]
A papyrus copy depicting the Epicurean tetrapharmakos in Philodemus' Adversus Sophistas – (P.Herc.1005), col. 5

Until the middle of the 18th century, the only papyri known were a few survivals from medieval times.[48] Most likely, these rolls never would have survived the Mediterranean climate and would have crumbled or been lost. Indeed, all these rolls have come from the only surviving library from antiquity that exists in its entirety.[2]

These papyri contain a large number of Greek philosophical texts. Large parts of Books XIV, XV, XXV, and XXVIII of the magnum opus of Epicurus, On Nature and works by early followers of Epicurus are also represented among the papyri.[21] Of the rolls, 44[citation needed] have been identified as the work of Philodemus of Gadara, an Epicurean philosopher and poet. The manuscript "PHerc.Paris.2" contains part of Philodemus' On Vices and Virtues.[2]

The Stoic philosopher Chrysippus is attested to have written over 700 works,[49] all of them lost, with the exception of a few fragments quoted by other authors.[50] Segments of his works On Providence and Logical Questions were found among the papyri;[50] a third work of his may have been recovered from the charred rolls.[51]

Parts of a poem on the Battle of Actium have also survived in the library.[52]

In May 2018, it was reported that fragments of the lost work Histories by Seneca the Elder had been found on a papyrus scroll (PHerc. 1067).[53]

In February 2023, classical scholar Richard Janko announced that he and Seales' team, assisted by artificial intelligence, had managed to read a small part of one heavily damaged, previously unreadable Herculaneum papyrus. The text appeared to be part of a lost work about Alexander the Great and the Diadochi.[54]

In April 2024, the research of a papyrologist at the University of Pisa uncovered details about Plato's burial site from the Herculaneum papyri using infrared and X-ray scanning techniques. This research revealed that Plato's tomb was situated within a garden designated for him at the Platonic school, close to the Mouseion dedicated to the muses.[55][56]

See also

[edit]

References

[edit]
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  31. ^ Brun; et al. (2016). "Revealing metallic ink in Herculaneum papyri". Proceedings of the National Academy of Sciences. 113 (14): 3751–3754. Bibcode:2016PNAS..113.3751B. doi:10.1073/pnas.1519958113. PMC 4833268. PMID 27001841.
  32. ^ Wade, Nicholas (21 September 2016). "Modern Technology Unlocks Secrets of a Damaged Biblical Scroll". The New York Times.
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  37. ^ W. Brent Seales (2011). Analysis Of Herculaneum Papyri With X-ray Computed Tomography (PDF). International Conference on nondestructive investigations and microanalysis for the diagnostics and conservation of cultural and environmental heritage. S2CID 7667891. Archived from the original (PDF) on 20 January 2019.
  38. ^ "Vesuvius Challenge". scrollprize.org. Retrieved 17 March 2023.
  39. ^ Sample, Ian (15 March 2023). "Contest launched to decipher Herculaneum scrolls using 3D X-ray software". The Guardian. Retrieved 17 March 2023.
  40. ^ "$700,000 grand prize (December 31st)". scrollprize.org. Vesuvius Challenge. Retrieved 13 October 2023.
  41. ^ Parker, Christopher (24 March 2023). "You Could Win $1 Million by Deciphering These Ancient Roman Scrolls". Smithsonian Magazine. Retrieved 13 October 2023.
  42. ^ "First word discovered in unopened Herculaneum scroll by 21yo computer science student". scrollprize.org. Vesuvius Challenge. 12 October 2023. Retrieved 13 October 2023.
  43. ^ Wade, Nicholas (12 October 2023). "Scrolls That Survived Vesuvius Divulge Their First Word". The New York Times. Retrieved 13 October 2023.
  44. ^ Sample, Ian (12 October 2023). "Researchers use AI to read word on ancient scroll burned by Vesuvius". The Guardian. Retrieved 13 October 2023.
  45. ^ "Prize Winners". Vesuvius Challenge. Retrieved 13 October 2023.
  46. ^ "Vesuvius Challenge 2023 Grand Prize awarded: we can read the first scroll!". Vesuvius Challenge. 5 February 2024. Retrieved 5 February 2024. Of the remaining submissions, the scores from our team of papyrologists identify a three-way tie for runner up.
  47. ^ Marchant, Jo (5 February 2024). "First passages of rolled-up Herculaneum scroll revealed". Nature. 626 (7999): 461–462. Bibcode:2024Natur.626..461M. doi:10.1038/d41586-024-00346-8. PMID 38316998. S2CID 267497364.
  48. ^ Frederic G. Kenyon, Palaeography of Greek papyri (Oxford, Clarendon Press, 1899), p. 3.
  49. ^ Diogenes Laërtius, Lives and Opinions of Eminent Philosophers, vii. 180
  50. ^ a b John Sellars, Stoicism. University of California Press, 2007. - p. 8
  51. ^ Fitzgerald, John T. (2004). "Philodemus and the Papyri from Herculaneum". In Fitzgerald, John T.; Obbink, Dirk; Holland, Glenn Stanfield (eds.). Philodemus and the New Testament world Philosophy. Brill. p. 11. ISBN 9004114602. The first of Chrysippus' partially preserved two or three works is his Logical Questions, contained in PHerc. 307 ... The second work is his On Providence, preserved in PHerc 1038 and 1421 ... A third work, most likely by Chrysippus is preserved in PHerc. 1020,
  52. ^ Gregory Hays, "Keeping Things Platonic: A new discovery of a possible lost book by Apuleius on Plato" [review of Justin A Stover, A New Work by Apuleius], Times Literary Supplement 20 May 2016 p. 29. Archived 2020-09-20 at the Wayback Machine.
  53. ^ Marino, Carlo (21 May 2018). "Lucius Anneus Seneca the Elder's Histories". European News Agency. Archived from the original on 25 May 2019. Retrieved 21 September 2021.
  54. ^ Owen Jarus (7 February 2023). "AI is deciphering a 2,000-year-old 'lost book' describing life after Alexander the Great". livescience.com. Retrieved 10 January 2024.
  55. ^ "The papyri of Herculaneum reveal the location of Plato's tomb". La Vanguardia. 25 April 2024. Retrieved 3 May 2024.
  56. ^ Magazine, Smithsonian; Anderson, Sonja. "This Newly Deciphered Papyrus Scroll Reveals the Location of Plato's Grave". Smithsonian Magazine. Retrieved 3 May 2024.

Further reading

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  • Armstrong, David (2011). "Epicurean virtues, Epicurean friendship: Cicero vs the Herculaneum papyri". In Fish, Jeffrey; Sanders, Kirk R. (eds.). Epicurus and the Epicurean Tradition. Cambridge University Press. pp. 105–128. doi:10.1017/cbo9780511921704.006. ISBN 978-0-521-19478-5.
  • Blank, David (1999). "Reflections on Re-reading Piaggio and the Early History of the Herculaneum Papyri". Cronache Ercolanesi. 29: 55–82.
  • Booras, Steven W.; Seely, David R. (1999). "Multispectral Imaging of the Herculaneum Papyri". Cronache Ercolanesi. 29: 95–100.
  • Houston, George W. (2013). "Thenon-Philodemusbookcollection in the Villa of the Papyri". In Woolf, Greg; König, Jason; Oikonomopoulou, Katerina (eds.). Ancient Libraries. Cambridge: Cambridge University Press. pp. 183–208. doi:10.1017/cbo9780511998386.014. ISBN 978-1-107-01256-1.
  • Janko, Richard (1992). "Colloquium 8: Philodemus Resartus: Progress in Reconstructing the Philosophical Papyri From Herculaneum 1". Proceedings of the Boston Area Colloquium in Ancient Philosophy. 7 (1): 271–308. doi:10.1163/2213441791X00150. ISSN 2213-4417.
  • Janko, Richard; Blank, David (1998). "Two New Manuscript Sources for the Texts of the Herculaneum Papyri". Cronache Ercolanesi. 28: 173–184.
  • Kleve, Knut (1996). "How to Read an Illegible Papyrus: Towards an Edition of PHerc. 78, Caecilius Statius, Obolostates sive faenerator". Cronache Ercolanesi. 26: 5–14.
  • Seales, W. Brent; Griffioen, Jim; Jacops, David (2010). "Virtual Conservation: Experience with Micro-CT and Manuscripts". In Vahtikari, Vesa; Hakkarainen, Mika; Nurminen, Antti (eds.). EIKONOPOIIA. Digital Imaging of Ancient Textual Heritage: Proceedings of the International Conference, Helsinki, 28–29 November 2010. Commentationes Humanarum Litterarum. Vol. 129. Helsinki: Finnish Society of Sciences and Letters. ISBN 978-951-653-386-8.
  • Sider, David (2005). The Library of the Villa dei Papiri at Herculaneum. Los Angeles: Getty Publications. ISBN 978-0-89236-799-3.
  • Vassallo, Christian (2021). The Presocratics at Herculaneum: A Study of Early Greek Philosophy in the Epicurean Tradition. With an Appendix on Diogenes of Oinoanda's Criticism of Presocratic Philosophy. Studia Praesocratica. Vol. 11. De Gruyter. doi:10.1515/9783110727661. ISBN 978-3-11-072766-1.
  • Zarmakoupi, Mantha, ed. (2011). The Villa of the Papyri at Herculaneum: Archaeology, Reception, and Digital Reconstruction. De Gruyter. doi:10.1515/9783110215434. ISBN 9783110203882.
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