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  1. By: Burkart, Arturo Erhardo,
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 57
    Issue: 3
    Date: 1976
    Page Range: 219--249
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  2. By: Burkart, Arturo Erhardo,
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 57
    Issue: 4
    Date: 1976
    Page Range: 450--525
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  3. By: Simpson, Beryl Brintnall - Burkart, Arturo Erhardo, - Carman, Neil J.
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 23
    Date: 1975
    Page Range: 220--227
    Publication Info: Berkeley, California Botanical Society,