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By "Pac, Helga Ihsle, (Born - 1955)"
Some population characteristics of the northern Yellowstone bison herd during the winter of 1988-1989 / prepared by Helga Ihsle Pac [and] Kevin Frey.
By: Pac, Helga Ihsle, - Frey, Kevin. - Montana.
Publication info: [Helena?] :Montana Department of Fish, Wildlife & Parks,
Contributed by: Montana State Library (archive.org)