SYMPOSIUM in Agricultural Research (1980: Maryland) <br/><br/>
Biological control in crop production 
/18-21 May 1980, Maryland, ;organized by the Barc Symposium V Committee 
 - Granada  Osmun Pub.  1980 
 - 461 pages. 
<br/><br/> Includes index. 
<br/><br/><label>Dewey Class. No.: </label>632.46  / SYM