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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Swallen, Jason Richard,
    Publication info: Chicago, Ill, Chicago Natural History Museum, 1955
    Holding Institution: University Library, University of Illinois Urbana Champaign
  2. By: Swallen, Jason Richard, - University of Nevada.
    Publication info: Washington, D.C, Division of Plant Exploration and Introduction, Bureau of Plant Industry, U.S. Dept. of Agriculture, 1940
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library