Grigg, D. B. <br/><br/>
The agricultural systems of the world :  an evolutionary approach / 
D. B. Grigg 
 - Cambridge :  Cambridge University Press,  1974 
 - 358 p. :  ill., maps. ;  24 cm. 
 - Cambridge geographical studies  v.5 .
<br/><br/>Includes bibliographies and indexes 
<br/><br/><label>ISBN: </label>0521202698 
<br/><br/><label>LCCN: </label>73-082451 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural geography<br/>Agriculture--History