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Respiratory Protective Devices Approved by the Bureau of Mines as of December 31, 1968: A Revision of Information Circular 8281
| Author: | Schutz, R. H. |
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| Year: | 1969 |
| Document Type: | N/A |
| SUDOC: | I 28.27:8436 |
| Series: | United States Bureau of Mines Reports |
| Report Number: | I. C. 8436 |
| Subjects: | Mine safety. |
| Breathing apparatus. | |
| Link: | http://digital.library.unt.edu/ark:/67531/metadc170825/ |
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