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Questions and Answers on Roof Support in Bituminous-coal Mines
Etats-Unis. Mines (Bureau)
United States. Bureau of Mines
A. J. Barry
J. J. Forbes
Edward Thomas (Mining engineer)
其他書名
A Handbook by J.J. Forbes, Edward Thomas and A.J. Barry
出版
U.S. Government Printing Office
, 1951
URL
http://books.google.com.hk/books?id=6PlGQwAACAAJ&hl=&source=gbs_api