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  1. By: Zarn, Mark. - Heller, Thomas, - Collins, Kay,
    Publication info: [Washington] : U.S. Dept. of the Interior, Bureau of Land Management : 1977.
    Holding Institution: Bureau of Land Management (archive.org)
  2. By: Zarn, Mark. - Heller, Thomas, - Collins, Kay, - 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)