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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Andrews, Horace J. (Horace Justin), - Cowlin, R. W. (Robert William),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1940
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Cowlin, R. W. (Robert William), - Briegleb, Philip A. (Philip Anthes), - Moravets, F. L. (Floyd Lester), - Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, Forest Service, 1942
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Bruce, David, - Cowlin, R. W. (Robert William),
    Publication info: [Portland, Or.], Pacific Northwest Forest and Range Experiment Station, 1968
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library