| Author: | Harrington, D. |
|---|---|
| Year: | 1920 |
| Document Type: | N/A |
| Series: | Report of investigations (United States. Bureau of Mines) |
| Report Number: | RI-2133 |
| Subjects: | Mine safety. |
| Mine ventilation. | |
| Ventilation, | |
| Metal trade. | |
| Link: | http://digital.library.unt.edu/ark:/67531/metadc100846/ |