Sixth five year plan 1980 - 85 

 -  1981 
 - 461p.  cm. 
<br/><br/><label>Standard No.: </label>249114 
<br/><br/><label>Source: </label> Textbook 
<br/><br/><label>Dewey Class. No.: </label>X:75.2'N80t5, M1