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  1. Ferns of Kentucky : with sixty full-page etchings and six wood-cuts, drawn by the author, illustrating structure, fertilization, classification, genera, and species / by John Williamson.
    By: Williamson, John,
    Publication info: Louisville (Ky.) :Printed by J.P. Morton & Co., W. Main Street,1878
    Contributed by: NCSU Libraries (archive.org)
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