Engineering & TechnologyModified longwall mining with a German coal planer (plow) in the Pocohontas No. 4 coal bed, Helen, W. VaWilbur A Haley![Modified longwall mining with a German coal planer (plow) in the Pocohontas No. 4 coal bed, Helen, W. Va]()
Modified longwall mining with a German coal planer (plow) in the Pocohontas No. 4 coal bed, Helen, W. Va
Wilbur A Haley
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“Modified longwall mining with a German coal planer (plow) in the Pocohontas No. 4 coal bed, Helen, W. Va” by Wilbur A Haley: a public-domain book in…
Catalogue details
- Author
- Wilbur A Haley
- Category
- Engineering & Technology
- Language
- English
- Source
- HathiTrust