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  1. By: Livingston, Burton E. (Burton Edward), - Hawkins, Lon A. (Lon Adrian), - Pulling, Howard E. (Howard Edward)
    Publication info: Washington, D.C, Carnegie Institution of Washington, 1915
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  2. By: Livingston, Burton E. (Burton Edward), - Hawkins, Lon A. (Lon Adrian), - Pulling, Howard E. (Howard Edward)
    Publication info: Washington, D. C, Carnegie Institution of Washington, 1915
    Holding Institution: Cornell University Library
  1. By: Pulling, Howard E. (Howard Edward)
    Type: Article
    In: American journal of botany
    Volume: 3
    Issue: 8
    Date: 1916-10
    Page Range: 393--406
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-
  2. By: Pulling, Howard E. (Howard Edward)
    Type: Article
    In: American journal of botany
    Volume: 9
    Issue: 1
    Date: 1922-01
    Page Range: 37--46
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-