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  1. By: Skiles, J. W. - Kortopates, P. T. - Van Dyne, George M., - Colorado State University. Range Science Department. - United States. Bureau of Land Management.
    Publication info: Fort Collins, Colorado, Colorado State University, 1981
    Holding Institution: Bureau of Land Management
  2. By: Loehle, Craig S. - Jump, R. Craig. - Van Dyne, George M., - United States. Bureau of Land Management.
    Publication info: [Denver, Colo.], [U.S. Department of the Interior, Bureau of Land Management], [1981]
    Holding Institution: Bureau of Land Management