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File:EB1911 Telescope - Fig. 19. Bruce Telescope, Yerkes Observatory.png

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English: EB1911 Telescope - Fig. 19. Bruce Telescope, Yerkes Observatory
Date
Source 1911 Encyclopædia Britannica, vol. 26 pp.569–570, Telescope article
Author AnonymousUnknown author

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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.

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Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:EB1911_Telescope_-_Fig._19._Bruce_Telescope,_Yerkes_Observatory.png

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