Mine transportation and market preparation; mine transportation--hoisting equipment--coal preparation,
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| 格式: | 圖書 |
| 語言: | English |
| 出版: |
New York [etc]
McGraw-Hill book company, inc.,
1926.
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| 版: | 1st ed. |
| 叢編: | Practical coal production.
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| 主題: |
| 實物描述: | vii, 354 p. illus., diagrs. 21 cm. |
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