File:Americana 1920 Mineralogy - Valuable Minerals.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 14:59, 5 October 2012 | ![]() | 1,415 × 2,127 (385 KB) | Bob Burkhardt | {{Information |Description={{en|A color chart showing ten minerals corresponding to the raw forms of commercially valuable metals, as well as a sample of coal and iron pyrite.}} |Source=''Encyclopedia Americana'', v. 19, 1920, facing p. 166. |Date=1912... |
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