TY  - BOOK
AU  - Langenkamp, Robert D,
TI  - Oil business fundamentals: -- exploration, leasing, drilling, production, marketing 
SN  - 0878141987
AV  - HD9560.5 L35
PY  - 1982///
CY  - Tulsa, oklahoma
PB  - Sci data
KW  - Industria del petróleo
ER  -