TY  - BOOK
AU  - Willmon,Gordon J.
ED  - Esso
ED  - World Petroleum Congress (12th : 1987 26 abr/1 may : Houston)
ED  - ESSO
TI  - Economic outlook for extra-heavy oils, natural bitumens and shale oils
U1  - 060-665.5 W938 1987 
ER  -