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  1. By: Vorhies, Charles T. (Charles Taylor), - Taylor, Walter P. (Walter Penn),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1922
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Vorhies, Charles T. (Charles Taylor),
    Publication info: 1916
    Holding Institution: Harvard University Botany Libraries
    BHL Collections: BHL Field Notes Project