Opler, Paul A. <br/><br/>
A field guide to eastern butterflies / 
Paul A. Opler ; illustrated by Vichai Malikul 
 - Boston :  Houghton Mifflin,  1992 
 - xvii, 396 p. :  ill., maps (some col.) ;  19 cm. 
 - The Peterson field guide series  4 .
<br/><br/> Spine title: Eastern butterflies  'Sponsored by the National Audubon Society, the National Wildlife Foundation, and the Roger Tory Peterson Institute.' 
<br/><br/>Includes bibliographical references (p. 359-362) and index 
<br/><br/><label>ISBN: </label>039563279X 
<br/><br/><label>LCCN: </label>91-044477 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Butterflies--East (U.S.)<br/>Butterflies--Canada, Eastern<br/>Butterflies--Greenland