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Please read BHL's Acknowledgment of Harmful Content
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  1. By: University of Pennsylvania. Botanical Laboratory. - University of Pennsylvania. Morris Arboretum.
    Publication info: Philadelphia, [s.n,
    Holding Institution: Penn State University
  2. By: University of Pennsylvania. Morris Arboretum.
    Publication info: Philadelphia, The Morris Arboretum of the University of Pennylvania,
    Holding Institution: Harvard University Botany Libraries
  3. By: University of Pennsylvania. Morris Arboretum.
    Publication info: Philadelphia, etc, Morris Arboretum, etc,
    Holding Institution: Multiple institutions