Cobb, Boughton.
A field guide to ferns and their related families : Northeastern and central North America with a section on species also found in the British Isles and Western Europe / Ferns [by] Boughton Cobb ; ill. by Laura Louise Foster. - Boston, MA : Houghton, 1984,c1956. - p. cm. - The Peterson field guide series ; 10 .
0395194318 (pbk.) 0395075602
Ferns--Identification.
587
A field guide to ferns and their related families : Northeastern and central North America with a section on species also found in the British Isles and Western Europe / Ferns [by] Boughton Cobb ; ill. by Laura Louise Foster. - Boston, MA : Houghton, 1984,c1956. - p. cm. - The Peterson field guide series ; 10 .
0395194318 (pbk.) 0395075602
Ferns--Identification.
587