Longwall retreat of gate road pillars
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Author
Contributions
- Bauer, Eric R. - Contributor
Publication
1993 - U.S. Dept. of the Interior, Bureau of Mines, Washington, D.C, District of Columbia
Language
English
Word Count
2,750 words, Guess
Page Count
11 pages
Identifiers
- Library of Congress Control Number92023498
- Open LibraryOL1720293M
Classifications
- DDC622 s
- DDC622/.334
- LCCTN23 .U43 no. 9444
and 1 more
- LCCTN288 .U43 no. 9444
Subjects
Topics
Longwall miningPillaring (Mining)Gate roads (Mining)Ground control (Mining)Longwall mining -- PennsylvaniaGate roads (Mining) -- PennsylvaniaGround control (Mining) -- Pennsylvania
Places
Series Statement
- Report of investigations ;
- 9444
- Report of investigations (United States. Bureau of Mines) ;
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