Coal through the ages
| Prif Awdur: | |
|---|---|
| Awdur Corfforaethol: | |
| Fformat: | Llyfr |
| Iaith: | English |
| Cyhoeddwyd: |
New York
Published for the Seeley W. Mudd Fund by the American Institute of Mining and Metallurgical Engineers
1939.
|
| Rhifyn: | 2d ed. |
| Cyfres: | A. I. M. E. series
|
| Pynciau: |