File:AmCyc Coal - Gamma group.jpg
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AmCyc_Coal_-_Gamma_group.jpg (221 × 188 pixels, file size: 13 KB, MIME type: image/jpeg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 22:48, 2 October 2018 | 221 × 188 (13 KB) | Bob Burkhardt | {{Information |description ={{en|1=Geological diagram of “Gamma” (or C) group in the coal measures.}} |date =published 1879 |source =“Coal,” ''The American Cyclopædia'', v. 4, 1879, p. 739. |author =Leo Lesquereux |permission ={{PD-1923}} }} Category:Coal Coal |
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