TY  - BOOK
AU  - Cochran,William
TI  - Mine subsidence-extent and cost of control in a selected area
T2  - Information circular
AV  - TN295 U4 no. 8507
PY  - 1971///
CY  - Washington
PB  - U.S. Bureau of Mines
KW  - Subsidences (Earth movements)
ER  -