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  1. By: Butz, George C., - Ray, Wm. Stanley. - Pennsylvania. Department of Agriculture.
    Publication info: [Harrisburg, Pa.], Wm. Stanley Ray, State Printer of Pennsylvania, 1904
    Holding Institution: Pennsylvania Horticultural Society
    BHL Collections: Expanding Access to Biodiversity Literature
  2. By: Pennsylvania State College. - Butz, George C.,
    Publication info: [Harrisburg, Pa, J. H. McFarland co., printers], c1900-
    Holding Institution: Library of Congress
  1. By: Butz, George C.,
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1890-08-12
    Publication Info: [1842-1904]