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  1. By: University of Pennsylvania. Botanical Laboratory.
    Publication info: Philadelphia, University of Pennsylvania Press, 1892-
    Holding Institution: Penn State University (archive.org)
  2. By: University of Pennsylvania. Botanical Laboratory. - University of Pennsylvania. Morris Arboretum.
    Publication info: Philadelphia, [s.n,
    Holding Institution: Penn State University (archive.org)
  3. By: University of Pennsylvania. Botanical Laboratory.
    Publication info: Philadelphia, University of Pennsylvania Press, 1892-1932
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden