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  1. By: Helms, John A - Ratliff, Raymond D
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 34
    Date: 1987
    Page Range: 77--90
    Publication Info: Berkeley, California Botanical Society,
  2. By: Helms, John A
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 34
    Date: 1987
    Page Range: 91--97
    Publication Info: Berkeley, California Botanical Society,