| Author: | Adams, W. W. |
|---|---|
| Year: | 1939 |
| Document Type: | N/A |
| Issuing Agency: | United States. Bureau of Mines. |
| SUDOC: | I 28.3 |
| Series: | United States Bureau of Mines Reports |
| Report Number: | Bulletin 422 |
| Subjects: | Mine accidents -- United States -- Statistics -- Periodicals. |
| Mineral industries -- Accidents -- United States -- Statistics -- Periodicals. | |
| Link: | http://digital.library.unt.edu/ark:/67531/metadc12584/ |