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  1. Results of boreal owl (Aegolius funereus) surveys on the Jefferson Division of the Lewis & Clark National Forest / by John C. Carlson, Montana Natural Heritage Program for the U.S.D.A. Forest Service, Lewis and Clark National Forest.
    By: Carlson, John C. - Lewis and Clark National Forest (Agency : U.S.) - Lewis and Clark National Forest (Mont.) - Montana Natural Heritage Program.
    Publication info: Helena, MT :Montana Natural Heritage Program,[1991]
    Contributed by: Montana State Library (archive.org)
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