Sand and gravel excavation. Part 6, Mining methods / by J.R. Thoenen.
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Other title: | Mining methods. |
Format: | Government Document Book |
Language: | English |
Published: |
[Washington, D.C.] :
U.S. Dept. of the Interior, Bureau of Mines,
1936.
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Series: | Information circular (United States. Bureau of Mines) ;
6879. |
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