Grigg, D.B. <br/><br/>
The agricultural systems of the world : An evolutionary approach 

 - London:  Cambridge University,  1974. 
 - 358p.;  24 cm 
<br/><br/><label>ISBN: </label>0 521 20269 8 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture
<br/><br/><label>Dewey Class. No.: </label>630  / GRI