Falls of roof in bituminous coal mines : influence of the seasons and rate of production / by J.W. Paul.
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Format: | Government Document Book |
Language: | English |
Published: |
Washington, D.C. :
U.S. Dept. of Commerce, Bureau of Mines : U.S. Govt. Print. Off,
1928.
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Series: | Technical paper (United States. Bureau of Mines) ;
410. |
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