| Author: | Friedel, Robert A. |
|---|---|
| Additional Authors: | Retcofsky, H. L. |
| Year: | 1967 |
| Document Type: | N/A |
| Issuing Agency: | United States. Bureau of Mines. |
| SUDOC: | I 28.3:640 |
| Series: | United States Bureau of Mines Reports |
| Report Number: | Bulletin 640 |
| Subjects: | Coal -- Analysis. |
| Coal -- Spectra. | |
| Link: | https://digital.library.unt.edu/ark:/67531/metadc12791/ |