Morrison, R.B., 1977, Soil associations, western half of the Tucson 1o x 2o quadrangle [(a) northern half, (b) southern half]: Arizona Bureau of Geology and Mineral Technology Open-File Report 83-02, 5 p., 2 sheets, scale 1:120,000.
Morrison, R.B., 1977, Soil associations, western half of the Tucson 1o x 2o quadrangle [(a) northern half, (b) southern half]: Arizona Bureau of Geology and Mineral Technology Open-File Report 83-02, 5 p., 2 sheets, scale 1:120,000.
Soil Survey,