Geologic map of the Helvetia 7 1/2' quadrangle, Pima County, Arizona
Document ID: ferguson-2009
2012
Ferguson, C.A., B.J. Johnson, P.A. Pearthree, J.E. Spencer, T.C. Shipman, and J.P. Cook. 2009. Geologic map of the Helvetia 7 1/2' quadrangle, Pima County, Arizona (v. 1.0). Open-File Report 09-06. Tucson, Arizona: Arizona Geological Survey. September.