Grigg, D.B. <br/><br/>
The agricultural systems of the world :  an evolutionary approach / 
D.B. Grigg. 
 - London :  Cambridge University Press,  1979. 
 - ix, 358 p. :  ill. ;  24 cm. 
 - Cambridge Geographical studies ;  5 .
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0521202698 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural systems.
<br/><br/><label>LC Class. No.: </label>S494 .5 .S95  / G75 1979