Clausen, Curtis P.  1893- <br/><br/>
Biological control of insect pests in the continental United States / 
by C.P. Clausen. 
 - Washington :  U.S. Dept. of Agriculture,  1956. 
 - vi, 151 p. :  maps ;  23 cm. 
 - Technical bulletin / United States Department of Agriculture ;  no. 1139 .
 - Technical bulletin (United States. Department of Agriculture) ;  no. 1139. .
<br/><br/> Includes index. 
<br/><br/>Literature cited: p. 135-143. 
<br/><br/><label>LCCN: </label>agr56000193  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Insect pests--Biological control--United States.
<br/><br/><label>LC Class. No.: </label>S21  / .A72 no. 1139 
<br/><br/><label>National Agricultural Library Call No.: </label>1  / Ag84Te no.1139