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2 Titles by Simpson, Donald Ray, (Born 1935) 

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  1. New species from South America, I-
    By: Simpson, Donald Ray,
    Publication info: Chicago, Ill.Field Museum of Natural History,1972.
    Contributed by: University of Illinois Urbana Champaign
    View record   View book
  2. A partial revision of Paullinia (Sapindaceae) for Ecuador, Peru, and Bolivia, part I / Donald R. Simpson.
    By: Simpson, Donald Ray,
    Publication info: Chicago, Ill. :Field Museum of Natural History,1976-
    Contributed by: University of Illinois Urbana Champaign
    View record   View book
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