File:Coal mining.png

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Revision as of 09:49, 27 April 2009 by imported>Milton Beychok ({{Image notes bypermission |Description = Diagram of various coal mining methods |Author = Stephen Greb |Date = Don't know |Source = http://www.uky.edu/KGS/coal/coal_mining.htm |Country first published in = United States |Copyright holder = Stephen Greb and Kentucky Geological Survey |Notes = |Other versions = }})
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Coal_mining.png ‎(646 × 335 pixels, file size: 12 KB, MIME type: image/png)

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