Problem Soil

Massanat, Y.M., 1980, Development of piping erosion conditions in the Benson area, Arizona, U.S.A.: Quarterly Journal of Engineering Geology London, v. 13, p.53-61.

Spencer, J.E., Ferguson, C.A., Richard, S.M., Orr, T.R., Pearthree, P.A., Gilbert, W.G., and Krantz, R.W., 2001, Geologic map of The Narrows 7 1/2' Quadrangle and the southern part of the Rincon Peak 7 1/2' Quadrangle, eastern Pima County, Arizona (revised May, 2002): Arizona Geological Survey Digital Geologic Map Series DGM-10, v. 1.1, 1 CD-ROM (32 p., 1 sheet, scale 1:24,000).

Pearthree, P.A., and Youberg, Ann, 2000, Surficial geologic maps and geologic hazards of the Green Valley - Sahuarita area, Pima County, Arizona, v. 1.0 [Sahuarita, Green Valley, Esperanza Mill, and Twin Buttes 7.5 min]: Arizona Geological Survey Digital Geologic Map Series DGM-03, 1 CD-ROM (21 p., 2 sheets, scale 1:24,000).

Pearthree, P.A., and Youberg, Ann, 2000, Surficial geologic maps and geologic hazards of the Green Valley - Sahuarita area, Pima County, Arizona [Sahuarita, Green Valley, Esperanza Mill, and Twin Buttes 7.5 min]: Arizona Geological Survey Open-File Report 00-13, 21 p., 2 sheets, scale 1:24,000 [now available as Arizona Geological Survey Digital Geologic Map Series DGM-03]

Pearthree, P.A., Ferguson, C.A., Gilbert, W.G., and Skotnicki, S.J., 2000, Geologic map and geologic hazards of the Three Points 7.5' quadrangle, Pima County, Arizona: Arizona Geological Survey Digital Geologic Map Series DGM-04, 1 CD-ROM (19 p., 1 sheet, scale 1:24,000).

Pearthree, P.A., Ferguson, C.A., Gilbert, W.G., and Skotnicki, S.J., 2000, Geologic map and geologic hazards of the Three Points 7.5' quadrangle, Pima County, Arizona: Arizona Geological Survey Open-File Report 00-12, 19 p., 1 sheet, scale 1:24,000.

Pearthree, P.A., and Biggs, T.H., 1999, Surficial geology and geologic hazards of the Tucson Mountains, Pima County, Arizona [Avra, Brown Mountain, Cat Mountain, and Jaynes 7.5 min]: Arizona Geological Survey Open-File Report 99-22, 19 p., 2 sheets, scale 1:24,000.

Klawon, J.E., Dickinson, W.R., and Pearthree, P.A., 1999, Surficial geology and geologic hazards of the northern Tucson Basin, Pima County, Arizona [Tucson North and Sabino Canyon 7.5 min]: Arizona Geological Survey Open-File Report 99-21, 28 p., 1 sheet, scale 1:24,000.

Klawon, J.E., Pearthree, P.A., Skotnicki, S.J., and Ferguson, C.A., 1998, Geology and geologic hazards of the Casa Grande area, Pinal County, Arizona [Stanfield, Casa Grande West, Casa Grande East, Coolidge, Double Peak, and Chuichu 7.5 min]: Arizona Geological Survey Open-File Report 98-23, 26 p., 6 sheets, scale 1:24,000.

Leighty, R.S., 1998, Compilation geologic map of the Daisy Mountain 7.5' quadrangle, Maricopa County, Arizona: Arizona Geological Survey Open-File Report 98-22, 30 p., 1 sheet, scale 1:24,000.