Ordish, George. <br/><br/>
Biological methods in crop pest control :  an introductory study / 
George Ordish 
 - London :  Constable,  1967. 
 - 242 p. :  ill. ;  23 cm. 
<br/><br/>Includes index and bibliography 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biological control--Pests
<br/><br/><label>Dewey Class. No.: </label>632.96  / ORB 1967