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 / by Edward Thomas [and others]
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Format: | Government Document Book |
Language: | English |
Published: |
[Washington, D.C.] :
U.S. Dept. of the Interior, Bureau of Mines,
1948.
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Series: | Information circular (United States. Bureau of Mines) ;
7471. |
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