TY  - RPRT
TI  - Geologic map of the Tucson and Nogales quadrangles (Arizona, scale 1:250,000): A digital database
AU  - J.A. Peterson
AU  - J. R. Berquist
AU  - S. J. Reynolds
AU  - S. S. Page-Nedell
AU  - Gustav P. Oland
AU  - Douglas M. Hirschberg
PY  - 2001
DO  - 10.3133/ofr01275
UR  - https://pubs.usgs.gov/publication/ofr01275
ID  - ofr01275
ER  -