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  1. By: Brum, Gilbert D.
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 22
    Date: 1973
    Page Range: 195--204
    Publication Info: Berkeley California Botanical Society
  2. By: Vasek, Frank C. - Johnson, H B - Brum, Gilbert D.
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 23
    Date: 1975
    Page Range: 114--130
    Publication Info: Berkeley California Botanical Society