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Literature <br /> Brady, N.C. 1974. The nature and properties of soils, eighth edition. The Macmillan Co., <br /> New York. 653 p. <br /> Cater, F. W. 1970. Geology of the Salt Anticline Region in Southwestern Colorado. U.S. <br /> Geological Survey Professional Paper 637. U.S. Government Printing Office. <br /> Washington D.C. 75 p. <br /> Fosberg, M.A. and A.L. Falen. 1983. Guide for preparing soil pedon descriptions <br /> (abbreviations, descriptions, and classifications), USDA-SCS and Univ. of <br /> Idaho - Dept. of Plant and Soil Sciences. 107 p. <br /> Guthrie, R.L. and J.E. Witty. March-April, 1982. New designations for soil horizons and <br /> layers and the new Soil Survey Manual. Comments and Letters to the Editor. Soil <br /> Sci. Soc. Am. J. Vol. 46, No. 2. p. 443-444. <br /> Hawn, William. May 27, 1987. Party leader, SCS San Migel Area Soil Survey. Personal <br /> Communication. <br /> Klute, A. ed., 1986. Methods of Soil Analysis, No. 9, Part I, 2nd ed., American Society <br /> of Agronomy, Madison, WI. 1188 p. <br /> Levesque, M. and E.D. Vendett. 1971. Selenium determination in soil and plant material. <br /> Canadian Journal of Soil Science. Vol. 51, p. 85-93. <br /> Nettleton, W.D., R.E. Nelson, B.R. Brasher, and P.S. Derr. 1982. Gypsiferous soils in <br /> the western United States. Chapter 9, in Acid Sulfate Weathering. Soil Science <br /> Society of America. p. 147-68. <br /> Page, A. L., ed. 1982. Methods of Soil Analysis, No. 9. Part II , 2nd ed., American <br /> Society of Agronomy, Madison, WI. 1159 p. <br /> Rosenfeld, I . and O.A. Beath. 1964. Selenium: Geobotany, Biochemistry, Toxicity, and <br /> . Nutrition. Academic Press, N.Y. 411 p. <br /> 9-5-29 Revised 04/11/88 <br />