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Experimental Longwall Mining in a Pennsylvania Anthracite Mine (In Two Parts).
Robert J. BrennanJohn W. BuchEdward R. Navrocky
其他書名
Use of yielding steel props
出版U.S. Department of the Interior, Bureau of Mines, 1964
URLhttp://books.google.com.hk/books?id=zcIfkAGaTWUC&hl=&source=gbs_api
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