Soil Survey

Harper, W.G., Youngs, F.O., Strahorn, A.T., Armstrong, S.W., and Schwalen, H.C., 1926, Soil survey of the Salt River Valley area, Arizona: U.S. Department of Agriculture, Bureau of Chemistry and Soils, Soil Survey Report, series 1926, no. 32, 55 p., 2 sheets.

Harper, W.G., and Youngs, F.O., 1927, Soil survey of the Buckeye-Beardsley area, Arizona: U.S. Department of Agriculture, Bureau of Chemistry and Soils, Soil Survey Report, series 1927, no. 3, 43 p., 1 sheet, scale 1:63,360.

Gelderman, F.W., 1972, Soil survey of the Tucson-Avra Valley area, Arizona: U.S. Department of Agriculture, Soil Conservation Service, 74 p., 33 sheets, scale 1:20,000.

Gelderman, F.W., 1970, Soil survey of the Safford area, Arizona: U.S. Department of Agriculture, Soil Conservation Service, 57 p., 29 sheets, scale 1:20,000.

Eckmann, E.C., Baldwin, M., and Carpenter, E.J., 1920, Soil survey of the middle Gila Valley area, Arizona: U.S. Department of Agriculture, Bureau of Soils, advance sheets, field operations of the Bureau of Soils, 1917, 37 p., 1 sheet.

Davis, S.E., 1976, The influence of slope aspect on selected soil properties, Greens Peak, Apache County, Arizona: Tucson, University of Arizona, M.S. thesis.

Clayton, N.A., 1975, Land use planning: Dinosaur Mountain area, Pinal County, Arizona: Tempe, Arizona State University, M.S. thesis, 57 p.

Chamberlin, E.G., and Richardson, M.L., 1974, Report and interpretations for the general soil map of Yuma County, Arizona: U.S. Department of Agriculture, Soil Conservation Service, 38 p., 1 sheet, scale 1:500,000.

Carpenter, E.J., 1924, Soil survey of the San Simon area, Arizona: U.S. Department of Agriculture, Bureau of Soils, advance sheets, field operations of the Bureau of Soils, 1921, 39 p., 1 sheet.

Butt, C.R., Hart, M.K., Gole, M.J., Hinkle, M.E., and Reimer, G.M., 1985, Gases and trace elements in soils at the North Silver Bell deposit, Pima County, Arizona: Journal of Geochemical Exploration, v. 24, p. 129-138.