Grigg, D. B. <br/><br/>
The Agricultural systems of the world :  an evolutionory approach / 
D.B. Grigg. 
 - Cambridge :  Cambridge Univerisity Press,  1974. 
 - ix, 358 p. :  ill. ;  23 cm. 
 - Cambridge geographical studies .
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural systems.
<br/><br/><label>LC Class. No.: </label>S494.5.S95  / G75 1974