Yieldable steel arches and yieldable steel ring supports in metal mines / by N.A. Eilertsen.
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| Format: | Government Document Book |
| Language: | English |
| Published: |
Washington :
U.S. Dept. of the Interior, Bureau of Mines,
1962.
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| Series: | Information circular (United States. Bureau of Mines) ;
8056. |
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