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Use of a Continuous Borer in Mining Pitching Anthracite Beds
William H. Tavenner
John T. Schimmel
出版
U.S. Department of the Interior, Bureau of Mines
, 1966
URL
http://books.google.com.hk/books?id=eNY1wqaaaKcC&hl=&source=gbs_api
EBook
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