Coal mining in Europe. A study of practices in different coal formations and under various economic and regulatory conditions compared with those in the United States
| Príomhchruthaitheoir: | |
|---|---|
| Rannpháirtithe: | |
| Formáid: | LEABHAR |
| Teanga: | English |
| Foilsithe / Cruthaithe: |
Washington
U.S. Govt. print. off.
1939.
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| Sraith: | U.S. Bureau of mines. Bulletin 414
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| Ábhair: |