Effects of ancient stream channel deposits on mine roof stability
a case study
poolt David K. Ingram- Vorming
- 33 lehekülgi
- Esmakordselt avaldatud
- 1987
- Kirjastajad
- U.S. Bureau of Mines
- Subjects
- Mine roof control·River channels·River channels·Pennsylvania·Pittsburgh region
- Keel
- English
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