A comparison of borer, ripper, and conventional mining products in Illinois No. 6 seam coal / by R.L. Schmidt, W.H. Engelmann, and R.R. Fumanti.
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Format: | Government Document Book |
Language: | English |
Published: |
[Washington, D.C.] :
U.S. Dept. of Interior, Bureau of Mines,
1972.
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Series: | Report of investigations (United States. Bureau of Mines) ;
7687. |
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