Testing safety catches on mine cages, Lake Superior district / by Clyde M. Pearce and Frank E. Cash.
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Format: | Government Document Book |
Language: | English |
Published: |
[Washington, D.C.] :
U.S. Dept. of the Interior, Bureau of Mines,
[1945]
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Series: | Information circular (United States. Bureau of Mines) ;
7325. |
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