File:Collier's 1921 Colorado - stamp mill.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 17:55, 29 April 2013 | 1,798 × 2,320 (663 KB) | Bob Burkhardt | {{Information |Description={{en|A “stamp mill” for crushing ore, near Silverton, Colorado.}} |Source=''Collier's New Encyclopedia'', v. 3, 1921, between pp. 164 and 165 (3rd plate). |Date=1921 |Author=Ewing Galloway |Permission={{PD-1923}} ... |
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