Year: | 1937 |
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Document Type: | USBI |
Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
SUDOC: | I 28.27:6946 |
Series: | Information circular / United States Department of the Interior, Bureau of Mines ; |
Report Number: | 6946 |
Subject: | Mine safety |
Link: | https://hdl.handle.net/2027/mdp.39015077569526 |