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  1. By: Youngken, Heber W. (Heber Wilkinson),
    Publication info: Philadelphia, P. Blakiston's Son, c1938
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
    BHL Collections: Missouri Botanical Garden's Materia Medica
  2. By: Youngken, Heber W. (Heber Wilkinson), - Stewart, Francis Edward,
    Publication info: Philadelphia, P. Blakiston's son & co, [c1914]
    Holding Institution: Cornell University Library
  3. By: Youngken, Heber W. (Heber Wilkinson),
    Edition: 2d ed., rev. and enl., with 195 illustrations.
    Publication info: Philadelphia, P. Blakiston's Son & Co, [©1918]
    Holding Institution: The New York Academy of Medicine
    BHL Collections: Expanding Access to Biodiversity Literature
  4. By: Youngken, Heber W. (Heber Wilkinson),
    Edition: 3d ed.
    Publication info: Philadelphia, P. Blakiston's son & co, [c1920]
    Holding Institution: Library of Congress
  5. By: Youngken, Heber W. (Heber Wilkinson),
    Edition: Ed. 3, rev.
    Publication info: Philadelphia, Blakiston, [1921]
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  1. By: Youngken, Heber W. (Heber Wilkinson),
    Type: Article
    In: Arnoldia
    Volume: 2
    Issue: 7
    Date: 1942
    Page Range: 37--40
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University
  2. By: Youngken, Heber W. (Heber Wilkinson),
    Type: Article
    In: American journal of botany
    Volume: 6
    Issue: 9
    Date: 1919-11
    Page Range: 380--386
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-