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  1. By: Smith, George, - Delaware County Institute of Science.
    Publication info: Philadelphia,Printed by H.B. Ashmead,1862.
    Holding Institution: Library of Congress
    Subjects: Delaware County  Delaware County (Pa.)  History  Natural history  Pennsylvania
  2. By: Smith, George, - Delaware County Institute of Science.
    Publication info: Philadelphia, Pa. :H.B. Ashmead,1862.
    Holding Institution: Allen County Public Library Genealogy Center (archive.org)
    Subjects: Delaware County  Delaware County (Pa.)  History  Natural history  Pennsylvania
  3. By: Smith, George, - Delaware County Institute of Science.
    Publication info: Philadelphia :Printed by Henry B. Ashmead,1862.
    Holding Institution: University of Pittsburgh Library System (archive.org)
    Subjects: Delaware County  Delaware County (Pa.)  History  Natural history  Pennsylvania