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File:Collier's 1921 Coal - mining with an electric drill.jpg

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Description
English: COAL MINING COAL WITH AN ELECTRIC DRILL.
Date published 1921
Source “Coal,” Collier's New Encyclopedia, v. 3, 1921, p. 30.
Author Unknown authorUnknown author
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Public domain
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.
Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Collier%27s_1921_Coal_-_mining_with_an_electric_drill.jpg

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Date/TimeThumbnailDimensionsUserComment
current18:29, 25 October 2017Thumbnail for version as of 18:29, 25 October 20171,470 × 821 (270 KB)Bob Burkhardt{{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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