File:Collier's 1921 Coal - mining with an electric drill.jpg
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DescriptionCollier's 1921 Coal - mining with an electric drill.jpg |
English: COAL MINING COAL WITH AN ELECTRIC DRILL. |
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Date | published 1921 | |||
Source | “Coal,” Collier's New Encyclopedia, v. 3, 1921, p. 30. | |||
Author | Unknown authorUnknown author | |||
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current | 18:29, 25 October 2017 | ![]() | 1,470 × 821 (270 KB) | Bob Burkhardt (talk | contribs) | {{Information |Description ={{en|1=COAL MINING COAL WITH AN ELECTRIC DRILL.}} |Source =“Cotton,” ''Collier's New Encyclopedia'', v. 3, 1921, p. 30. |Author =unknown artist |Date =published 1921 |Permission ={{PD-192... |
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