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LITERATURE CITED <br />• Brady, N.C. 1974. The nature and properties of soils, eighth edition. The Macmillan Co., New York. <br />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. Washington D.C. 75 <br />P• <br />Fosberg, M.A. and A.L. Falen. 1983. Guide for preparing soil pedon descriptions (abbreviations, <br />descriptions, and classifications), USDA-SCS and Univ. of Idaho -Dept. of Plant and Soil Sciences. <br />107 p. <br />Guthrie, R.L. and J.E. Witty. March-April, 1982. New designations for soil horizons and layers and <br />the new Soil Survey Manual. Comments and Letters to the Edftor. Soil Sci. Soc. Am. J. Vol. 46, No. <br />2. p. 443-444. <br />Hawn, William. May 27, 1987. Parry 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. Canadian <br />Journal of Soil Science. Vol. 51, p. 85-93. <br />Natural Resource Conservation Service. 1984. Colorado Important Farmland Inventory. NRCS <br />Colorado. <br />Natural Resource Conservation Service. 1996. National Soil Survey Handbook, Chapter 657.5, <br />Identification of Important Farmlands. Washington DC. <br />Natural Resource Conservation Service. Unpublished. Soil Survey of San Miguel Area, Colorado, Parts <br />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 western <br />United States. Chapter 9, in Acid Sulfate Weathering. Soil Science Society of America. p. 147-68. <br />Page, A. L., ed. 1982. Methods of Soil Analysis, No. 9. Part II, 2nd ed., American Society of <br />a (REVISED 9/99) 2.04.9-18 <br />