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  1. Catalogue of the Bryophyta (hepatics, anthocerotes and mosses) and Pteridophyta (ferns and fern-allies) found in Pennsylvania.
    By: Porter, Thomas C. - Small, John Kunkel,
    Publication info: Boston,Ginn & Co.,1904.
    Contributed by: Cornell University Library
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  2. Flora of Pennsylvania,
    By: Porter, Thomas C. - Small, John Kunkel,
    Publication info: Boston,Ginn & Company,1903.
    Contributed by: Library of Congress
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  3. Flora of Pennsylvania,
    By: Porter, Thomas C. - Small, John Kunkel,
    Publication info: Boston,Ginn & Company,1903.
    Contributed by: Cornell University Library
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