Author: Peterson, Rolf Olin.
Title: Wolf Ecology and Prey Relationships on Isle Royale. [National Park Service Scientific Monograph Series Number Eleven].
Description: Washington: Government Printing Office, 1977. xx, 210 pp, photo illustrations, graphs, text tables. Original printed paper wraps. 23 cm x 15 cm. Spine very slightly discoloured, minor wear to spine head.

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