Selected geologic factors affecting mining of the Pittsburgh coalbed /
by C.M. McCulloch ...[et al.]
- [Washington] : U.S. Dept. of the Interior, Bureau of Mines, [1975].
- 72 p. : ill. (some col.), maps.
- Report of investigations ; 8093 .
- United States. Bureau of Mines. Report of investigations ; 8093 .
- Report of investigations (United States. Bureau of Mines) ; 8093 .
91055142
Coal mines and mining--Pennsylvania.
Coal mines and mining--West Virginia.
91055142
Coal mines and mining--Pennsylvania.
Coal mines and mining--West Virginia.