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Donald J. Ortner Papers, National Anthropological Archives, Smithsonian Institution.
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Bunch, T. D., Hoffmann, Robert S., and Nadler, C. F., J. 1999. "Cytogenetics and Genetics." In Mountain Sheep of North America. Valdez, R. and Krausman, P. R., editors. 263–276. University of Arizona Press.
Geist, V., Hoffmann, Robert S., and Gara, B. O. 1999. "Taxonomy and the Conservation of Biodiversity." In Ecology and Management of Large Mammals in North America. Demarais, S. and Krausman, P. R., editors. 1–16. Prentice Hall Publ.
Hoffmann, Robert S., Jones, J. Knox, Jr., Carter, D. C., Genoways, Hugh H., Rice, Dale W. and Jones, Clyde. 1986. Revised Checklist of North American Mammals North of Mexico. Lubbock, Texas: Texas Tech University Press, 22 pp., 1 pp.
Bunch, T. D., Hoffmann, Robert S. and Nadler, C. F., J. 1999. Cytogenetics and Genetics. In: Valdez, R. and Krausman, P. R., Mountain Sheep of North America. : University of Arizona Press,() pp.263-276.
Rickart, E. A., Hoffmann, Robert S. and Rosenfeld, M. 1987. Karyotype of Spermophilus townsendii artemesiae (Rodentia: Sciuridae) and Chromosomal Variation in the Spermophilus townsendii Complex. Mammalian Chromosome Newsletter, 26: 94-102.
Hoffmann, Robert S., Vorontsov, N. N., Frisman, L. V. and Nadler, C. F. S. 1987. Populyatsionaya Genetika i Genogeografiya Dikikh Mlekopitayushchikh [Population Genetics and Genegeography of Wild Mammals.]. Genetika, 23: 725-737.