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  1. Wild, free-roaming burros : status of present knowledge /
    By: Zarn, Mark. - Collins, Kay, - Heller, Thomas, - United States. Bureau of Land Management.
    Publication info: [Washington] :U.S. Dept. of the Interior, Bureau of Land Management ;1977.
    Holding Institution: Bureau of Land Management (archive.org)
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  2. Wild, free-roaming horses : status of present knowledge /
    By: Zarn, Mark. - Collins, Kay, - Heller, Thomas,
    Publication info: [Washington] : U.S. Dept. of Agriculture, U.S. Forest Service, 1977.
    Holding Institution: Bureau of Land Management (archive.org)
    View Book