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  1. Pennsylvania trees.
    By: Illick, Joseph Simon,
    Publication info: Harrisburg, Pa.W.S. Ray, State Printer1914
    Contributed by: Gerstein - University of Toronto (archive.org)
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  2. Pennsylvania trees / by J.S. Illick.
    By: Illick, Joseph Simon,
    Publication info: Harrisburg., Pa. :W. S. Ray, State Printer,1915.
    Contributed by: University of California Libraries (archive.org)
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