Economics of tractor cultivation and economics of 

 - Chandigarh  Govt Press India         
 - Economic and statistical organisation publication  1969-70 .
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture Labour
<br/><br/><label>Dewey Class. No.: </label>X9(J):(D5138).243r, (GD)