D . B.Grigg <br/><br/>
The Agricultureal  System of the World: An Evolutionary Approach 

 - London  Cambridge University Press   1974 
 - ix;, 358p.  ill;,23cm. 
<br/><br/> include, Appendix, Bibliography, Index, Notes 
<br/><br/><label>ISBN: </label>0 521 09843 2