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  1. Contributions from the Botanical Laboratory and the Morris Arboretum of the University of Pennsylvania.
    By: University of Pennsylvania. - University of Pennsylvania.
    Publication info: Philadelphia :[s.n.,
    Contributed by: Penn State University (archive.org)
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  2. Contributions from the Botanical Laboratory of the University of Pennsylvania.
    By: University of Pennsylvania.
    Publication info: Philadelphia :University of Pennsylvania Press,1892-1932.
    Contributed by: Mertz Library, The New York Botanical Garden
    BHL Collections: New York Botanical Garden
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  3. Contributions from the Botanical Laboratory.
    By: University of Pennsylvania.
    Publication info: Philadelphia :University of Pennsylvania Press,1892-
    Contributed by: Penn State University (archive.org)
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