TY  - GEN
AU  - McCulloch,C.M.
ED  - United States.
TI  - Selected geologic factors affecting mining of the Pittsburgh coalbed
T2  - Report of investigations
PY  - 1975///]
CY  - [Washington]
PB  - U.S. Dept. of the Interior, Bureau of Mines
KW  - Coal mines and mining
KW  - Pennsylvania
KW  - West Virginia
ER  -