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6.0 LITERATURE CITED <br />Beetle, A. A. 1970. Recommended plant names. University of Wyoming Ag. <br />Exp. Station Res. J. 31. Laramie. <br />Cochran, W. G. 1977. Sampling techniques. John Wiley and Sons, New York. <br />Colorado Natural Heritage Inventory. 1980. Candidate plant species of <br />special concern. Colorado Department of Natural Resources, Natural <br />Areas Program, Denver. <br />Hylander, C. J. 1966. Wildlife conmunities. Houghton Mifflin Co., Boston. <br />Kiichler, A. W. 1966. Potential natural vegetation of the conterminous <br />United States. American Geographical Society, New York. <br />Marr, J. W. 1967. Ecosystems of the east slope of the Front Range in <br />Colorado. University of Colorado Studies, Series in Biology, No. 8, <br />Univ. of Colorado Press, Boulder. <br />Mueller-Dombois, D. and H. Etlenberg. 1974. Aims and methods of vegetation <br />ecology. John Wiley and Sons, New York. <br />• Nickerson, M. R., G. E. Brink, and C. Feddema. 1976. Principal range <br />plants of the Central and Southern Rocky Mountains: names and symbols. <br />USDA Forest Service, Gen. Tech. Rept. RM-20, Rocky Mountain Forest and <br />Range Exper. Sta., Fort Collins. <br />Shelford, V. E. 1963. The ecology of North America. University of <br />Illinois Press, Urbana. <br />Thorton, B. J., H. D. Harrington, and R. L. Zimdahl. 1974. Weeds of <br />Colorado. Colorado State University Agric. Exper. Sta., Bulletin <br />514-5 (revised!. Fort Collins. <br />U.S. Fish and Wildlife Service IUSFWSI. 1980. Review of plant taxa for <br />listing as threatened or endangered species. Federal Register 45(2421: <br />82480-82569. <br />Weber, W. A. and 8. C. Johnston. 1979. Natural history inventory of <br />Colorado. I. Vascular plants, lichens, and bryophytes. University <br />of Colorado Museum, Boulder. <br />Weber, W. A. 1976. Rocky Mountain flora. Colorado Assoc. University <br />Press, Boulder. <br /> <br />-42- <br />