Grigg, David B. <br/><br/>
The  agricultural systems of the world :  an evolutionary approach / 
D. B Grigg. 
 - London :  Cambridge University Press,  1974. 
 - ix, 458 p. ;  24 cm. 
 - Cambridge geographical studies .
<br/><br/>Includes bibliography and index. 
<br/><br/> Open access. 
<br/><br/><label>ISBN: </label>0521098432 
<br/><br/><label>LCCN: </label>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural geography.<br/>Agriculture--History.