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Guide to eastern ferns.

APA Citation

Wherry, E. T. (Edgar Theodore). (19481942). Guide to eastern ferns. [2d ed.] Philadelphia: University of Pennsylvania Press.

Wherry, Edgar T. (Edgar Theodore), 1885-1982. Guide to Eastern Ferns. [2d ed.] Philadelphia: University of Pennsylvania Press, 19481942.

Warning: These citations may not always be complete (especially for serials).