TY  - RPRT
TI  - Preliminary geologic map of the Empire Mountains Quadrangle, Pima County, Arizona
AU  - T.L. Finnell
PY  - 1971
DO  - 10.3133/ofr71106
UR  - https://pubs.usgs.gov/publication/ofr71106
ID  - ofr71106
ER  -