| Year: | 1923 |
|---|---|
| Document Type: | USBM |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines : |
| SUDOC: | I 28.7:344 |
| Series: | Technical paper / United States Department of the Interior, Bureau of Mines ; |
| Report Number: | 344 |
| Subjects: | Coal--Analysis |
| Coal--Ohio | |
| Link: | https://hdl.handle.net/2027/mdp.39015095082098 |