Contours of change 

 - (Washington :  Government Printing Office),  (1970) 
 - 366 p.  : ilus. 
<br/><br/><label>LCCN: </label>55229 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultura--E.U.A.
<br/><br/><label>Dewey Class. No.: </label>630.5  / Y4 1970