Dvortsov, E. F. <br/><br/>
High - powered tractors and their implements, including aspects of their impact on the soil 

 - New York :  United Nations,  1979 
 - [20] p.  : gráfs. 
 - AGRI/MECH report  ; 80 .
 - AGRI - MECH report  ; 80 .
<br/><br/><label>LCCN: </label>67390 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Labranza--Efecto en suelos<br/>Tractores.