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• LITERATURE CITED <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 Idaho -Dept. <br />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 Sci. <br />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 of <br />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 />Natural Resource Conservation Service.1984. Colorado Important Farmland <br />Inventory. NRCS Colorado. <br />Natural Resource Conservation Service. 1996. National Soil Survey Handbook, <br />Chapter 657.5, Identification of Important Farmlands. Washington DC. <br />Natural Resource Conservation Service. Unpublished. Soil Survey of San Miguel Area, <br />Colorado, Parts of Dolores, Montrose and San Miguel Counties. <br />Nettleton, W.D., R.E. Nelson, B.R. Brasher, and P.S. Derr. 1982. Gypsiferous soils in the <br />(REVISED 9/99) 2.04.9-19 <br />