GRIGG, D. B. <br/><br/>
The Agricultural System of the World: An Environmental Approach. 

 - New York;  Cambridge University Press,  1974. 
 - ix,  358 p.  ill. 
<br/><br/> Includes Appendix, Bibliography and Index. 
<br/><br/><label>ISBN: </label>9780521098434 
<br/><br/><label>Dewey Class. No.: </label>630 GRI.