| Author: | Crump, Lulie H. |
|---|---|
| Year: | 1969 |
| Document Type: | N/A |
| Series: | United States Bureau of Mines Reports |
| Report Number: | I. C. 8411 |
| Subjects: | Coal -- United States -- Statistics. |
| Natural gas -- United States -- Statistics. | |
| Petroleum -- United States -- Statistics. | |
| Link: | http://digital.library.unt.edu/ark:/67531/metadc170806/ |