TY  - BOOK
AU  - United states, Mines (Bureau of-)
ED  - United states, Mines (Bureau of-)
TI  - Cost analysis of model mines for strip mining of coal in the U S
T2  - US, National Technical Information Service
U1  - X9(F551):26.73.N7, L2/GD 
PY  - 1972///
CY  - Washington
PB  - Govt Printer USA        
KW  - Coal  Industry
ER  -