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  1. Results of Harlequin duck (Histrionicus histrionicus) surveys in wilderness areas of the Flathead National Forest, Montana / by David N.B. Lee and David L. Genter to the U.S.D.A. Forest Service, Flathead National Forest.
    By: Lee, David N. B. - Genter, David Leon. - Flathead National Forest (Agency : U.S.) - Montana Natural Heritage Program.
    Publication info: Helena, MT :Montana Natural Heritage Program,1991.
    Contributed by: Montana State Library (archive.org)
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  2. Results of Harlequin duck (Histrionicus histrionicus) surveys in 1990 on the Flathead National Forest, Montana / by John C. Carlson to the U.S.D.A. Forest Service, Flathead National Forest.
    By: Carlson, John C. - Flathead National Forest (Agency : U.S.) - Montana Natural Heritage Program.
    Publication info: Helena, MT :Montana Natural Heritage Program,[1990]
    Contributed by: Montana State Library (archive.org)
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  3. Results of the 1989 survey for Harlequin ducks (Histrionicus histrionicus) on the Kootenai National Forest, Montana and the Flathead National Forest, Montana : a preliminary report to USDA Forest Service, Kootenai National Forest [and] Flathead National Forest / by Lisa M. Fairman [et al.].
    By: Fairman, Lisa M. - Flathead National Forest (Agency : U.S.) - Kootenai National Forest (Mont. and Idaho) - Montana Natural Heritage Program.
    Publication info: Helena, MT :Montana Natural Heritage Program,[1989?]
    Contributed by: Montana State Library (archive.org)
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