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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Thomas, Friedrich August Wilhelm,
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
    BHL Collections: Engelmann Papers, Missouri Botanical Garden
  2. By: Thomas, Friedrich August Wilhelm,
    Publication info: Jena, G. Fischer, 1914
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library