A field guide to ferns and their related familiesBoughton Cobb, Cheryl Lowe, Elizabeth Farnsworth · First published 1999 · Latest edition 2005Open the Tome
Ferns and their related families of northeastern and central North AmericaBoughton Cobb · First published 1985Open the Tome
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 WesBoughton Cobb · First published 1975Open the Tome
A field guide to the ferns and their related families of northeastern and central North AmericaCobb, Boughton. · First published 1956Open the Tome
A field guide to the ferns and their related families of Northeastern and Central North America with a section on species also found in the British Isles and Western EuropeBoughton Cobb · First published 1956Open the Tome
