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  1. By: Rodgers, Andrew Denny,
    Publication info: Princeton,Princeton University Press;1914.
    Holding Institution: Internet Archive
    Subjects: 1810-1888  Botanists, American  Botany  Gray, Asa,  United States
  2. By: Harshberger, John William,
    Publication info: Philadelphia[T.C. Davis]1899
    Holding Institution: University of Toronto - Gerstein Science Information Centre
    Subjects: Biography  Botanists, American  Botany  History  Philadelphia (Pa.)  
  3. By: Harshberger, John W. (John William),
    Publication info: Philadelphia[Press of T. C. Davis & son]1899.
    Holding Institution: Multiple institutions
    Subjects: Biographies  Biography  Botanik  Botaniker  Botanists, American  Botany  Geschichte Anfänge - 1895  History  PA  Pennsylvania  Philadelphia  Philadelphia (Pa.)