Free, J.B. <br/><br/>
Insect pollination of crops 

 - London  Academic press  1970 
 - xi, 544 pages 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>50961 
<br/><br/><label>Dewey Class. No.: </label>631.53  / FRE