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  1. By: Hansen, Albert A
    Type: Article
    In: Torreya
    Volume: 22
    Issue: 5
    Date: 1922
    Page Range: 73--77
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945
  2. By: Hansen, Albert A
    Type: Article
    In: Torreya
    Volume: 18
    Issue: 4
    Date: 1918
    Page Range: 65--69
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945
  3. By: Hansen, Albert A
    Type: Article
    In: Torreya
    Volume: 17
    Issue: 4
    Date: 1917
    Page Range: 55--58
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945
  4. By: Hansen, Albert A - Benedict, Ralph C. (Ralph Curtiss), - Hastings, G T
    Type: Article
    In: Torreya
    Volume: 23
    Issue: 5
    Date: 1923
    Page Range: 85--89
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945