This study was supported by Macalester College, the Minnesota Department of Conservation, the USDA Forest Service, the U.S. Bureau of Sport Fisheries and Wildlife, and the New York Zoological Society. Pilots John Winship, Pat Magie, Jack Burgess, and Don Murray flew the observation planes during radiotracking. Miss Elizabeth Dayton, Mr. Wallace C. Dayton, and the Quetico-Superior Foundation, all of Minneapolis, financed Mech during the writing of this report. Thanks are also due L. J. Verme, J. P. Kelsall, and J. M. Peek for their helpful reviews. LITERATURE CITED Foromozov, A. N. 1946. The snow cover as an environment factor and its importance in the life of mammals and birds. (Moskovskoe obshchestvo ispytatelei priroda) Materialy k poznaniyu fauny i flory SSSR, Otdel. Zool. n. 5 (XX). (Translation from Russian published by Boreal Institute, Univ. Alberta, Edmonton, Alberta.) Kelsall, J. P. 1968. The caribou. Can. Wildl. Serv. Monog. 3, 340 p. Kelsall, J. P. 1969. Structural adaptations of moose and deer for snow. J. Mammal. 50: 302-310. Mech, L. D. 1966. Hunting behavior of wolves in Minnesota. J. Mammal. 47: 347-348. Mech, L. D. 1970. The wolf: the ecology and behavior of an endangered species. 389 p. New York: Natural History Press, Doubleday. Nasimovich, A. A. 1955. The role of the regime of snow cover in the life of ungulates in the U.S.S.R. Moskva, Akademiya Nauk SSSR. 403 p. Pimlott, D. H., Shannon, J. A., and Kolenosky, G. B. 1969. The ecology of the timber wolf in Algonquin Provincial Park. Out. Dep. Lands and Forests Res. Rep. (Wildl.) 87, 92 p. Rutter, R. J., and Pimlott, D. H. 1968. The world of the wolf. 202 p. Philadelphia and New York: J. B. Lippincott Co. Stenlund, M. H. 1955. A field study of the timber wolf (_Canis lupus_) on the Superior National Forest, Minnesota. Minn. Conserv. Dep. Tech. Bull. 4, 55 p. Verme, L. J. 1968. An index of winter severity for northern deer. J. Wildl. Manage. 32: 566-574. THE POSSIBLE OCCURRENCE OF THE GREAT PLAINS WOLF IN NORTHEASTERN MINNESOTA L. David Mech and L. D. Frenzel, Jr. The timber wolf (_Canis lupus_) of northeastern Minnesota occupies an area within the range given by Goldman (1944) for the eastern timber wolf (_C. l. lycaon_ Schreber). However, this area is within 150 miles of the eastern edge of the former range of the Great Plains wolf (_C. l. nubilus_ Say), and there is some question as to whether the Minnesota wolf is really an intergrade between these two subspecies. Writing of _nubilus_, Goldman (1944, p. 444) stated: "Specimens from eastern Minnesota and Michigan seem more properly referable to _lycaon_, but relationship to _nubilus_ is shown in somewhat intermediate characters."