File:Coal mining.png: Revision history

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11 April 2022

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11 October 2010

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27 April 2009

  • curprev 10:4910:49, 27 April 2009‎ imported>Milton Beychok‎ 507 bytes +507‎ {{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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