Upton, Martin. <br/><br/>
Agricultural production economics and resource-use 

 - London :  Oxford,  1976 
 - 339 p.  ; gráfs. 
<br/><br/><label>LCCN: </label>44801 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultura--Aspectos económicos.
<br/><br/><label>Dewey Class. No.: </label>338.1  / U6