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  1. By: Snell, Walter H. (Walter Henry),
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1922.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  1. By: Snell, Walter H. (Walter Henry),
    Type: Article
    In: American journal of botany
    Volume: 10
    Issue: 8
    Date: 1923-10
    Page Range: 399--411
    Publication Info: Lancaster, Pa. :Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens,1914-