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REFERENCES CITED <br /> American Ornithologists' Union. 1982. Thirty-fourth supplement of the American <br /> Ornithologists' Union check-list of North American birds. Auk 99(3): lcc-16cc. <br /> Biggins, D. 1987. U. S. Fish and Wildlife Service, Fort Collins, Colorado. Personal <br /> communication to S. Viert, Cedar Creek Associates, Inc.,Fort Collins, Colorado. July <br /> 28, 1987. <br /> Jobman, W. G. and M. E. Anderson. 1981. Potential present range of the black-footed <br /> ferret as of January 1, 1981, U.S.Fish and Wildlife Service,Pierre,South Dakota. 65 <br /> PP. <br /> Jones, Jr., J. K., D. C. Carter, and H. H. Genovays. 1979. Revised checklist of North <br /> American mammals north of Mexico, 1979. Occasional Papers the Museum Texas <br /> Tech University 62: 1-17. <br /> Masden, D. 1987, Colorado Division of Wildlife, Montrose, Colorado. Personal <br /> communication to M. Phelan, Cedar Creek Associates, Inc., Fort Collins, Colorado. <br /> November 20, 1987. <br /> Stebbins, R. C. 1%6. A field guide to western reptiles and amphibians. Houghton <br /> Mifflin Company,Boston. 279 pp. <br /> U. S. Fish and Wildlife Service. 1986. Black-footed ferret survey guidelines for <br /> compliance with The Endangered Species Act. USFWS, Denver, Colorado and <br /> Albuquerque,Nev Mexico. 13 pp. <br /> 13 <br />