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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Landgraf, A. E. - Rocky Mountain Forest and Range Experiment Station (Fort Collins, Colo.)
    Publication info: Fort Collins, Colo, Rocky Mountain Forest and Range Experiment Station, 1959
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Landgraf, A. E. - Ostmark, H. Eugene. - Rocky Mountain Forest and Range Experiment Station (Fort Collins, Colo.) - United States. Forest Service.
    Publication info: Fort Collins, Colo, Rocky Mountain Forest and Range Experiment Station, 1958
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library