| Author: | Porter, Horace C. |
|---|---|
| Additional Authors: | Ralston, Oliver C. |
| Year: | 1916 |
| Document Type: | USBM |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| SUDOC: | I 28.7:113 |
| Series: | Technical paper / United States Department of the Interior, Bureau of Mines ; |
| Report Number: | 113 |
| Subject: | Coal |
| Link: | https://hdl.handle.net/2027/mdp.39015077561499 |