Ferns of Kentucky : with sixty full-page etchings and six wood-cuts, drawn by the author, illustrating structure, fertilization, classification, genera, and species - Williamson, John, (Louisville (Ky.), Printed by J.P. Morton & Co., W. Main Street, 1878)
https://www.biodiversitylibrary.org/bibliography/37852
Keywords: Ferns|Kentucky|