TY  - BOOK
AU  - Northrop,John D.
TI  - Petroleum in 1917
T2  - Mineral Resources of the United States, 1917-Part II
U1  - 343.077 
PY  - 1919///
CY  - Washington, D.C.
PB  - Government Printing Office
KW  - MINERIA
KW  - PETROLEO
N1  - Impreso
ER  -