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Effects of Various Longwall Chain Pillar Configurations on Gate Road Stability
Jeffrey M. Listak
Joseph C. Zelanko
Timothy M. Barton
出版
U.S. Department of the Interior, Bureau of Mines
, 1988
URL
http://books.google.com.hk/books?id=74pgmgm8GbsC&hl=&source=gbs_api
EBook
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