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Falls of coal and rock on man-trips in bituminous-coal mines
Detailed descriptions of several accidents, indicating probable causes and ways of preventing them.
Falls of coal and rock on man-trips in bituminous-coal mines
Detailed descriptions of several accidents, indicating probable causes and ways of preventing them.
Falls of coal and rock on man-trips in bituminous-coal mines
U S Bur Mines -- Information Cir
Owings, C.W. (author)
1935
7 pages
Report
English
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