Strength of steel roof bolts after repeated bending / by Frank L. Gaddy.
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Main Author: | |
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Format: | Government Document Book |
Language: | English |
Published: |
[Washington, D.C.] :
U.S. Dept. of the Interior, Bureau of Mines,
1958.
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Series: | Report of investigations (United States. Bureau of Mines) ;
5408. |
Subjects: |