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  1. By: Roy, Douglass F. - California Forest and Range Experiment Station.
    Publication info: Berkeley, Calif, California Forest and Range Experiment Station, [1955]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Tackle, David, - Roy, Douglass F. - California Forest and Range Experiment Station.
    Publication info: Berkeley, Calif, California Forest and Range Experiment Station, [1953]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  1. By: Roy, Douglass F.
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 21
    Date: 1972
    Page Range: 462--462
    Publication Info: Berkeley, California Botanical Society,