The world coal-mining industry.
| निगमित लेखक: | |
|---|---|
| स्वरूप: | पुस्तक |
| भाषा: | English |
| प्रकाशित: |
Nendeln
Kraus Reprint
1975.
|
| श्रृंखला: | Studies and reports. Series B (Economic conditions)
nos. 31-32 |
| विषय: |