A Field Guide to the Ferns and Their Related Families, Boughton Cobb. 1963. Boston, Mass: Houghton Mifflin Company.
A Field Manual of the Ferns and Fern Allies of the United States and Canada, D. B. Lellinger. 1985. Washington, DC: Smithsonian ...
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A Field Manual of the Ferns and Fern Allies of the United States and Canada, D. B. Lellinger. 1985. Washington, DC: Smithsonian ...
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