Author: | Harrington, D. |
---|---|
Year: | 1930 |
Document Type: | BMRA |
Issuing Agency: | U.S. Dept. of Commerce, Bureau of Mines, |
SUDOC: | C 22.12:2993 |
Series: | Report of investigations / United States Department of Commerce, Bureau of Mines ; |
Report Number: | 2993 |
Subject: | Coal mines and mining--Safety measures |
Link: | https://hdl.handle.net/2027/mdp.39015077566332 |