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. |
| Subjects: |