The fern guide
Subtitle: northeastern and midland United States and adjacent Canada
By: by Edgar T. Wherry ; illus. by James C. W. Chen
Publisher: Morris Arboretum of the University of Pennsylvania
Published: 1972
Place of publication: Philadelphia
Language: eng
Number of pages: 318
Subjects: Ferns -- United States -- Identification; Pteridophyta -- Identification
Notes: Reprint of the 1961 ed. published by Doubleday, Garden City, N.Y

Bibliography: p. 35