Year: | 1943 |
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Document Type: | USBI |
Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
SUDOC: | I 28.27:7268 |
Series: | Information circular ; |
Report Number: | 7268 |
Subjects: | Coal mines and mining--Safety regulations--United States |
Mine inspection--Standards--United States | |
Lignite industry--Standards--United States | |
Bituminous coal industry--Standards--United States | |
Link: | https://hdl.handle.net/2027/mdp.39015074127039 |