Sweetman H L <br/><br/>
Principles of biological control 
Sweetman H L 
 -  1958 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>52322 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture
<br/><br/><label>Dewey Class. No.: </label>J:438:55, J8