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Roof-fall Resupport Accidents
Juel H. StearsJohn P. ConwayRobert C. Bates
其他書名
A Study
出版U.S. Department of the Interior, Bureau of Mines, 1976
URLhttp://books.google.com.hk/books?id=1CpZ0AEACAAJ&hl=&source=gbs_api