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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Youngberg, Alv Dan
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 21
    Date: 1971
    Page Range: 124--124
    Publication Info: Berkeley, California Botanical Society,
  2. By: Youngberg, Alv Dan
    Type: Article
    In: Rhodora
    Volume: 72
    Date: 1970
    Page Range: 548--550
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],