Opler, Paul A. <br/><br/>
A field guide to eastern butterflies / 
 Eastern butterflies 
Paul Opler ; illustrated by Vichai Malikul 
 - Boston, Mass. :  Houghton Mifflin,  c1992 
 - 396 p. :  ill. (some col.), maps 
 - The Peterson field guide series ;  4 .
<br/><br/> "Sponsored by the National Audubon Society, the National Wildlife Foundation, and the Roger Tory Peterson Institute" 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>039563279X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>BUTTERFLIES--EAST (U.S.)<br/>BUTTERFLIES--CANADA, EASTERN<br/>BUTTERFLIES--GREENLAND
<br/><br/><label>LC Class. No.: </label>QL551 .E16  / O643F