TY  - BOOK
AU  - Cobb,Boughton
TI  - 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 Europe 
T2  - The Peterson field guide series, 10
U1  - 587.3 23
PY  - 1956///, c 1963
CY  - Boston
PB  - Houghton Mifflin
KW  - Ferns
KW  - North America
N1  - Bibliography: p. [263]-267
ER  -