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LITERATURE CITED <br /> American Ornithologists' Union. 1957. Checklist of North American birds. <br /> Fifth E01ition, Baltimore, Maryland. <br /> American Ornithologists' Union. 1973. Thirty-second supplement to the <br /> American Ornithologists' checklist of North American birds. A.O.U. <br /> Comm ttee on Classification and Nomenclature, The Auk, 90(2) : <br /> (411-419) . April 1973. <br /> Borrow, D.J. and P.E. White. 1970. A field guide to the insects. Houghton- <br /> Nlifflon Company, Boston, I:assachusetts. 404 pp. <br /> Call, M.W. 1978. Nesting habits and surveying techniques for co=n <br /> western raptors. Bureau of Land Managament, Denver Service Center, <br /> Technical Note TN-316. 115 pp. <br /> Clark, T.W. 1978. Current status of black-footed ferret in Wyoming. <br /> Journal of Wildlife Management. 42(1) : 128-134. <br /> Cook, A.H. 1949. Fur-bearer investigations. New York State Conservation <br /> Department, P-R Project Report 1-R, Supplement G. <br /> Division of Wildlife. n.d. Wildlife in danger. Colorado Division of <br /> Wildlife, Non-game Section. 31 pp. <br /> Federal Register, Vol. 44, No. 12. January 17, 1979. List of endangered <br /> and threatened wildlife and plants. U.S. Government Printing Office, <br /> Washington, D.C. <br /> Hall, E.R. and K.R. Kelson. 1959. The meals of North America. Ronald <br /> Press Company, New York. 1,162 pp. <br /> Henderson, R.R. , P.F. Springer, and R. Adrian. 1974. The black-footed <br /> ferret in South Dakota. South Dakota Department of Care, Fish and <br /> Parks, Technical Bulletin No. 4: 1-37. <br /> Hickey, J.J. 1942. Eastern populations of the duck hawk. Auk: (59) <br /> 176-204. <br /> Lechleitner, R.R. 1969. Wildlife manmals of Colorado. Pruett Publishing <br /> Company, Boulder, Colorado. 254 pp. <br /> Linduska, J.P. , ed. 1964. Waterfowl tomnorrow. U.S. Government Printing <br /> Office, Washington, D.C. 770 pp. <br /> Linhart, S.B. and F.F. Knowlton. 1973. Determination of relative carnivore <br /> densities in the western 17nited States. Annual Meetinq American <br /> Society of Mammalogists. 63. 9pp. <br /> Llnyd, M. an.-? R.J. (,helardi. 1964. A table for calculating the "equit- <br /> auility" ccmpoiien t of species diversity. Journal of Animal Ecology <br /> 33: 217-255. <br /> -52- <br /> JUN i i 19so <br />