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  1. By: Young, Robert A. (Robert Armstrong),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1923
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Young, Robert A. (Robert Armstrong),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1924
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  1. By: Young, Robert A. (Robert Armstrong),
    Type: Article
    In: Arnoldia
    Volume: 6
    Issue: 7-9
    Date: 1946
    Page Range: 29--43
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University