Lower San Pedro

U.S. Geological Survey, 1982, Annual summary of ground-water conditions in Arizona, Spring 1980 to Spring 1981: U.S. Geological Survey Water-Resources Investigations Open-File Report 82-0368, 2 sheets, scale 1:1,000,000.

U.S. Geological Survey, 1981, Annual summary of ground-water conditions in Arizona, Spring 1979 to Spring 1980: U.S. Geological Survey Water-Resources Investigations Open-File Report 81-0906, 2 sheets, scale 1:1,000,000.

Babcock, H.M., 1977, Annual summary of ground-water conditions in Arizona, Spring 1976 to Spring 1977: U.S. Geological Survey Water-Resources Investigations 77-0106 Open-File Report, 2 sheets, scale 1:1,000,000.

Robson, S.G., and Banta, E.R., 1995, Ground water atlas of the United States, Segment 2, Arizona, Colorado, New Mexico, Utah: U.S. Geological Survey Hydrologic Investigations Atlas HA-0730-C, 32 p.

Babcock, H.M., 1976, Annual summary of ground-water conditions in Arizona, Spring 1974 to Spring 1975: U.S. Geological Survey Water-Resources Investigations 76-0059 Open-File Report, 2 sheets, scale 1:1,000,000.

Arizona Department of Water Resources, 1994, Arizona water resources assessment, V. II, Hydrologic summary: Arizona Department of Water Resources, Hydrology Division, 236 [266] p.

Arizona Department of Water Resources, 1994, Arizona water resources assessment, V. I, Inventory and analysis: Arizona Department of Water Resources, 253 p.

Tellman, Barbara, Glass, Clint, Wallace, John, and Fuller, J.E., 2000, An overview of Pima County's watersheds and watercourses: Pima County, Ariz., Sonoran Desert Conservation Plan Report, 215 p.

Spencer, J.E., 2002, Natural occurrence of arsenic in Southwest ground water: Southwest Hydrology, v. 1, no. 1, p. 14-15.

Anderson, T.W., and Freethey, G.W., 1995, Simulation of ground-water flow in alluvial basins in south-central Arizona and parts of adjacent states, Regional Aquifer-System Analysis: U.S. Geological Survey Professional Paper 1406-D, 78 p.