Upton, Martin <br/><br/>
Agricultural production economics and ecological approach 

 - Oxford  University Press  1976 
 - 357 p. 
<br/><br/> 20778 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geography
<br/><br/><label>Dewey Class. No.: </label>338.13  / U