Opler, Paul A. <br/><br/>
Butterflies east of the Great Plains :  an illustrated natural history / 
Paul A. Opler and George O. Krizek 
 - Baltimore :  Johns Hopkins University Press,  1984 
 - 294 p. ;  30 cm. 
<br/><br/>Includes bibliographies and index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Butterflies--United States<br/>Insects--United States