| Author: | Breckenridge, L. P. |
|---|---|
| Additional Authors: | Kreisinger, Henry |
| Year: | 1912 |
| Document Type: | N/A |
| SUDOC: | I 28.3:23 |
| Series: | United States Bureau of Mines Reports |
| Report Number: | Bulletin 23 |
| Subject: | Coal -- Testing. |
| Link: | http://digital.library.unt.edu/ark:/67531/metadc38736/ |