工程与技术Methods of development and pillar extraction in mining the Pittsburgh coal bed in Pennsylvania, West Virginia, and OhioJ. W Paul![Methods of development and pillar extraction in mining the Pittsburgh coal bed in Pennsylvania, West Virginia, and Ohio]()
Methods of development and pillar extraction in mining the Pittsburgh coal bed in Pennsylvania, West Virginia, and Ohio
J. W Paul
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《Methods of development and pillar extraction in mining the Pittsburgh coal bed in Pennsylvania, West Virginia, and Ohio》，J. W…
书目信息
- 作者
- J. W Paul
- 分类
- 工程与技术
- 语言
- 英语
- 来源
- HathiTrust