PhilipN
Reverted edits by Jpauljones (talk) to last revision by WesleyS
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WesleyS
cat
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link
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AddisonDM
no edit summary
21:00
+195
Reverted edits by DrSandstone (Talk) to last version by Hsmom
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DrSandstone
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Hsmom
Appears to have been copied from http://www.eia.doe.gov/glossary/glossary_u.htm without attribution - see my talk page.
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Aschlafly
New page: A shortwall mining system consists of a room-and-pillar mining system in which the working face is wider than usual but smaller (less than 150 feet) than that in longwall mining. [[cat...
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