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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Erickson, Ralph O
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 32
    Date: 1945
    Page Range: 413--460
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-
  2. By: Erickson, Ralph O - Brenner, Louis G - Wraight, Joseph
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 29
    Date: 1942
    Page Range: 89--101
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-
  3. By: Erickson, Ralph O
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 28
    Date: 1941
    Page Range: 293--298
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-
  4. By: Erickson, Ralph O
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 30
    Date: 1943
    Page Range: 63--68
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-
  5. By: Erickson, Ralph O
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 30
    Date: 1943
    Page Range: 1--62
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-
  6. By: Erickson, Ralph O
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 6
    Date: 1942
    Page Range: 259--260
    Publication Info: Berkeley, California Botanical Society,