TY  - RPRT
TI  - Preliminary geologic map of the Cerro Cobachi area, Sonora, Mexico
AU  - K. B. Ketner
AU  - J.H. Noll
PY  - 1987
DO  - 10.3133/mf1980
UR  - https://pubs.usgs.gov/publication/mf1980
ID  - mf1980
ER  -