Open-File Report 01-275
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First posted June 11, 2001
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Peterson, J. A., Berquist, J. R., Reynolds, S. J., Page-Nedell, S. S., Digital database by Oland, Gustav P., Hirschberg, Douglas M., 2001, Geologic map of the Tucson and Nogales quadrangles (Arizona, scale 1:250,000): A Digital Database: U. S. Geological Survey Open-File Report 01-275, 25 pp., https://pubs.usgs.gov/of/2001/0275/.