TY  - BOOK
AU  - Cochran,William
ED  - United States.
TI  - Mine subsidence extent and cost of control in a selected area
U1  -  622 
PY  - 1971///
CY  - Washington
PB  - U.S. Government Printing Office
KW  - Subsidences (Earth movements)
KW  - Mining engineering
KW  - Coal mines and mining
KW  - Pennsylvania
ER  -