TY  - BOOK
AU  - Moebs,Noel N.
TI  - Subsidence over four room-and-pillar sections in southwestern Pennsylvania
T2  - Report of investigations
U1  - 622.8 
PY  - 1982///
CY  - Washington, D.C.
PB  - U.S. Dept. of the Interior, Bureau of Mines
KW  - Mine subsidence
KW  - Pennsylvania
KW  - Measurement
KW  - Coal mines and mining
KW  - Safety measures
ER  -