A key to the ferns of Pennsylvania.
Subtitle: Includes a non-technical key for investigation of each of the fifty-nine species found in the state; directions for use of the key; an outline for aid in identification of ferns by sterile fronds alone; distribution of species through the state; and a list of ferns found in the vicinity of Johnstown, Cambria County.
By: [By] Elsie Deane Canan.  Illus. by Elizabeth Trent.
Publisher: Science Press]
Published: 1946
Place of publication: [Lancaster, Pa
Language: eng
Number of pages: 112
Subjects: Ferns -- Pennsylvania.