Cobb, Boughton <br/><br/>
A field guide to 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 
 - xviii, 281 p. :  ill. ;  29 cm. 
 - The Peterson field guide .
<br/><br/>Bibliography : p. 263-267 
<br/><br/><label>ISBN: </label>0395975123 (pbk.)  RM72.36 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ferns--Identification--North America