TY  - BOOK
AU  - McCulloch, C. M.
AU  - Sullivan,C.D.
AU  - Jeran,P.W.
ED  - United States Department of the Interior.
TI  - Geologic investigations of underground coal mining problems
T2  - Report of investigations / Bureau of Mines, U.S. Department of the Interior
PY  - 1975///]
CY  - Washington, D.C.
PB  - U.S. Dept. of the Interior
KW  - Coal mines and mining
ER  -