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
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| フォーマット: | 図書 |
| 言語: | English |
| 出版事項: |
Washington
U.S. Govt. print. off.
1939.
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| シリーズ: | U.S. Bureau of mines. Bulletin 414
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| 主題: |