Author: | Schrenk, H. H. |
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Additional Authors: | Pearce, S. J. |
Year: | 1943 |
Document Type: | USBI |
Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
SUDOC: | I 28.27:7236 |
Series: | Information circular / United States Department of the Interior, Bureau of Mines ; |
Report Number: | 7236 |
Subjects: | Respirators (Medical equipment) |
Breathing apparatus | |
Mineral industries--Safety measures | |
Gas masks | |
Link: | https://hdl.handle.net/2027/mdp.39015074126965 |