Helfer, Jacques R. <br/><br/>
How to know the grasshoppers, cockcroaches [sic] and their allies:  pictured-keys for identifying many of the grasshoppers, crickets, Katydids, earwigs, termites, cockroaches, praying mantids, rock-crawlers, and walkingsticks occuring in North America, north of Mexico. 
All illus. drawn by Jacques R. Helfer. 
 - Dubuque, Iowa,  W. C. Brown Co.  [1963] 
 - 353 p.  illus.  22 cm. 
 - Pictured key nature series .
<br/><br/><label>LCCN: </label>63015071  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Orthoptera--North America.
<br/><br/><label>LC Class. No.: </label>QL507.1  / .H45 
<br/><br/><label>Dewey Class. No.: </label>595.726