Accident experience and direct costs in some Colorado coal mines, 1929-33 / by E.H. Denny and F.R. Jennings.
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| Format: | Government Document Book |
| Language: | English |
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[Washington, D.C.] :
U.S. Dept. of the Interior, Bureau of Mines,
1935.
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| Series: | Information circular (United States. Bureau of Mines) ;
6860. |
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