| Author: | Hopkins, G. R. |
|---|---|
| Year: | 1929 |
| Document Type: | N/A |
| SUDOC: | I 28.3:297 |
| Series: | United States Bureau of Mines Reports |
| Report Number: | Bulletin 297 |
| Subject: | Petroleum industry and trade -- United States. |
| Link: | http://digital.library.unt.edu/ark:/67531/metadc38774/ |