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Control of roof and prevention of accidents from falls of rock and coal
Suggested roof supports for use at faces in conjunction with mechanical loading.
Control of roof and prevention of accidents from falls of rock and coal
Suggested roof supports for use at faces in conjunction with mechanical loading.
Control of roof and prevention of accidents from falls of rock and coal
U S Bur Mines -- Information Cir
Thomas, E. (author) / Seeling, C.H. (author) / Perz, F. (author) / Hansen, M.V. (author)
1948
9 pages
Supp plates
Report
English
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