Azziz, Girolamo. <br/><br/>
Agricultural ecology / 
G. Azziz. 
 - London :  Constable ,  1956. 
 - 424 p. :  ill. ;  23 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Crop yields.
<br/><br/><label>Dewey Class. No.: </label>633