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farnpflanzen

A field manual of the ferns & fern-allies of the United States & Canada

By David B. Lellinger

Ferns and allied plants

By Tryon, Rolla Milton

A Field Guide to Ferns and Their Related Families Northeastern and Central North America With a Section on Species Also Found in British Isle and Wes

By Boughton Cobb

Polypodiaceae

By P. H. Hovenkamp,H. P. Nooteboom,M. Kato