The world coal-mining industry.
| Awdur Corfforaethol: | |
|---|---|
| Fformat: | Llyfr |
| Iaith: | English |
| Cyhoeddwyd: |
Nendeln
Kraus Reprint
1975.
|
| Cyfres: | Studies and reports. Series B (Economic conditions)
nos. 31-32 |
| Pynciau: |