| Author: | Read, T. T. |
|---|---|
| Year: | 1920 |
| Document Type: | N/A |
| Series: | United States Bureau of Mines Reports |
| Report Number: | Circular No. 2115 |
| Subjects: | Miners -- Education -- United States. |
| Mineral engineering -- Vocational guidance. | |
| Link: | http://digital.library.unt.edu/ark:/67531/metadc100845/ |