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Studies of Roof Movement in Coal Mines
Earl R. MaizeHarold Putnam Greenwald
其他書名
2. Crucible Mine of the Crucible Fuel Co
出版U.S. Department of the Interior, Bureau of Mines, 1939
URLhttp://books.google.com.hk/books?id=I6d0E8M0o2QC&hl=&source=gbs_api
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