Effect of changes in moisture and temperature on mine roof. [No.] 1, Report on strata overlying the Pittsburgh coal bed
Irving Hartmann
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“Effect of changes in moisture and temperature on mine roof. [No.] 1, Report on strata overlying the Pittsburgh coal bed” by Irving Hartmann: a public-domain…
Catalogue details
- Author
- Irving Hartmann
- Category
- Politics & Economics
- Language
- English
- Source
- HathiTrust