80-9 heavy duty disc plough and 81-9 heavy duty trash disc plough :  instruction book 

 - S.l. :  s.n.,  19- 
 - 29 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Tractors
<br/><br/><label>LC Class. No.: </label>TL233.5  / M37