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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: Williamson, John,
    Publication info: Louisville, Ky.,Printed by J.P. Morton,1878.
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
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