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4.0 LITERATURE CITED <br />Beetle, A.A. 1970. Recommended plant names. Agricultural Experiment <br />Station Research Journal 31, University of Wyoming, Laramie. <br />Colorado Natural Areas Program (CNAP). 1986. Plant species of special <br />concern. Colorado Department of Natural Resources, Denver, CO. <br />Mueller-Dombois, D. and H. Ellenberg. 1974. Aims and methods of <br />vegetation ecology. John Wiley & Sons, New York. <br />Nickerson, M.F., G.E. Brink, and C. Feddema. 1976. Principal range <br />plants of the central and southern Rocky Mountains: names and <br />symbols. USDA Forest Service, General Technical Report RM-20. <br />Thornton, B.J., H.D. Harrington, and R.L. Zimdahl. 1974. Weeds of <br />Colorado. Experiment Station Bulletin 514-5, Revised. Colorado <br />State University, Fort Collins. <br />U.S. Bureau of Land Management (BLM). 1981. Threatened, endangered, <br />and sensitive plant species policy and list for Colorado. <br />Instruction Memorandum No. C081-291, Denver. <br />U.S. Fish and Wildlife Service (USFWS). 1980. Review of plant taxa for <br />listing as threatened or endangered species. Federal Register 45 <br />(242):82480-82569. <br />Wyoming Department of Environmental Quality (WDEQ). 1984. Guideline <br />No. 2, Vegetation. Land Quality Division, State Office Building, <br />Cheyenne, Wyoming. <br />Weber, W.A. 1986. Curator of the Herbarium, University of Colorado, <br />personal communic4tion. <br />Weber, W.A. and B.C. Johnston. 1979. Natural history inventory of <br />Colorado. I. Vascular plants, lichens, and bryophytes. <br />University of Colorado Museum, Boulder. <br /> <br />29 <br />,,.~ - - -- <br />