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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Pyrah, Duane B.
    Publication info: [Helena, MT], Wildlife Division, Montana Dept. of Fish, Wildlife, and Parks in cooperation with Bureau of Land Management, U.S. Dept. of the Interior, Billings, MT, 1987
    Holding Institution: Montana State Library
    Subjects: Fergus County  Mammals  Montana  Petroleum County  Pronghorn  
  2. By: Bachen, Daniel A. - Burkholder, Braden, - Maxell, Bryce A. (Bryce Alan) - United States. Bureau of Land Management. - Montana Natural Heritage Program.
    Publication info: Helena, Montana, Montana Natural Heritage Program, 2020
    Holding Institution: Montana State Library
    Subjects: Bats  Behavior  Montana  Petroleum County  Statistics  
  3. By: Hendricks, P. - Montana Natural Heritage Program. - United States. Bureau of Land Management. - United States. Bureau of Land Management. Lewistown Field Office.
    Publication info: Helena, Mont, Montana Natural Heritage Program, c2000
    Holding Institution: Montana State Library
    Subjects: Baird's sparrow  Bird surveys  Birds  Brewer's sparrow  Brown-headed cowbird  Counting  Fergus County  Geographical distribution  Grasshopper sparrow  Grassland birds  Lark bunting  Long-billed curlew  Montana  Musselshell River (Mont.)  Petroleum County  Ponderosa pine  Roadside transect  Sage thrasher  Sagebrush  Savannah sparrow  Short-eared owl  Sprague's pipit  Upland sandpiper  Vesper sparrow  Western meadowlark  
  4. By: Lesica, Peter. - Nature Conservancy (U.S.). Montana Field Office, - Nature Conservancy (U.S.). Wyoming Chapter,
    Publication info: Helena, MT, The Nature Conservancy, 1987
    Holding Institution: Montana State Library
    Subjects: Fergus County  Forests and forestry  Montana  Petroleum County  Plants