TY  - BOOK
AU  - Argall, George Oates
ED  - International Coal Exploration Symposium 2
TI  - Coal exploration: Proceedings of the second international coal exploration symposium, denver, colorado, u.s.a. october 1978 
SN  - 0879301074
AV  - TN271.C58 I57 1978
PY  - 1979///
CY  - San francisco, calif.
PB  - Freeman
KW  - Carbón
KW  - Congresos
KW  - Prospección
ER  -