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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Porsild, Morten P. (Morten Pedersen), - Porsild, A. E.
    Publication info: København, B. Lunos bogt, 1920 [i.e. 1926]-
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
  2. By: Porsild, A. E. - Cody, William J.
    Publication info: Ottawa, National Museum of Natural Sciences, National Museums of Canada, c1980
    Holding Institution: Smithsonian Libraries and Archives