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  1. Response of elk to Exxon's field development in the Riley Ridge area of western Wyoming, 1979-1990 /
    By: Exxon Company U.S.A. - Hayden-Wing Associates. - Wyoming.
    Publication info: Sheridan, Wyo. : Hayden-Wing Associates, [1990]
    Contributed by: Bureau of Land Management (archive.org)
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