Cobb, Boughton. <br/><br/>
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 / 
Illustrated by Laura Louise Foster. 
 - Boston :  Houghton Mifflin,  1956, c 1963 
 - xviii, 281 p. :  ill. ;  20 cm. 
 - The Peterson field guide series, 10 .
<br/><br/>Bibliography: p. [263]-267. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ferns
<br/><br/><label>Subjects--Geographic Terms: </label><br/>North America
<br/><br/><label>Dewey Class. No.: </label>587.3  / COF 1963