Introduction of tractors in a subsistence farm economy :  a study of tractor introduction on a co-operative basis in Comilla Kotwali Thana, East Pakistn. 

 - Comilla :  PARD ,  1962 
 - 63p. :  ill. ;  22 cm.  
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural mechanization--Comilla--Bangladesh
<br/><br/><label>Dewey Class. No.: </label>631.3  / PARD