Grigg, D B <br/><br/>
Agricultural systems of the world  an evolutionary approach 

 - New York  Cambridge university press  1974 
 - 358p.; 22cm. 
 - Cambridge geographical studies .
<br/><br/><label>ISBN: </label>521098432 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural development<br/>Agriculture<br/>Dairying<br/>Ranching