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  1. By: Ponce, Stanley L. - United States. Forest Service. - United States. Forest Service. Watershed Systems Development Group.
    Publication info: Fort Collins, Colo. :Watershed Systems Development Group, USDA Forest Service,[1980, i.e. 1982]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Williams, Owen R. - Daddow, Richard L. - United States. Forest Service. Watershed Systems Development Group.
    Publication info: Fort Collins, Colo. :USDA Forest Service, Watershed Systems Development Group,1984.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library