Mechanical mining in some bituminous-coal mines. Progress report 8, Methods and equipment used in underground development / by J.J. Shields,, J.J. Dowd, and W.A. Haley.
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Other title: | Methods and equipment used in underground development. |
Format: | Government Document Book |
Language: | English |
Published: |
[Washington, D.C.] :
U.S. Dept. of the Interior, Bureau of Mines,
1957.
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Series: | Information circular (United States. Bureau of Mines) ;
7813. |
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