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Coal Mine Roof Rating (CMRR)
Gregory M. MolindaChristopher Mark
其他書名
A Practical Rock Mass Classification for Coal Mines
出版U.S. Department of Interior, Bureau of Mines, 1994
URLhttp://books.google.com.hk/books?id=Q4IQAQAAMAAJ&hl=&source=gbs_api
EBookFULL_PUBLIC_DOMAIN