TY  - BOOK
AU  - Iannacchione,Anthony T.
TI  - Geologic factors in predicting coal mine roof-rock stability in the Upper Kittanning Coalbed, Somerset County, Pa.
PY  - 1981///
CY  - Bureau of Mines, Washington, D.C.
PB  - U.S. Dept. of the Interior
KW  - Coal mines and mining
KW  - Pennsylvania
KW  - Somerset County
KW  - Safety measures
KW  - Ground control (Mining)
KW  - Rock mechanics
KW  - Geology, Stratigraphic
N1  - Bibliography: p.37-40
ER  -