Pyle, Robert Michael. <br/><br/>
The Audubon Society field guide to North American butterflies / 
Robert Michael Pyle ; visual key by Carol Nehring and Jane Opper. 
 - A Chanticleer Press ed. 
 - New York :  Knopf :  Distributed by Random House,  c1981. 
 - 916 p. :  ill. (some col.) ;  20 cm. 
 - Audubon Society field guide series .
<br/><br/> Includes indexes. 
<br/><br/><label>ISBN: </label>0394519140 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Butterflies--Identification.--North America<br/>Insects--Identification.<br/>Insects--Identification.--North America
<br/><br/><label>LC Class. No.: </label>QL548  / .P94 1981 
<br/><br/><label>Dewey Class. No.: </label>595.78/9097