TY  - BOOK
AU  - Butler,G.M.
AU  - Allen,Milton Arthur
TI  - Petroleum,
T2  - Arizona. State Bureau of Mines. Bulletin,
AV  - TN1 .A65 no. 4, 1921
PY  - 1921///
CY  - Tucson, Ariz.
PB  - University of Arizona, Bureau of Mines
KW  - Petroleum
KW  - Geology
N1  - At head of title: ... University of Arizona bulletin; "Selected bibliography": p. 44-45
ER  -