Principles and recommendations for the 1970 population cencuses. 

 - New York  UN           1967 
 - viip.  cm. 
 - Statistical papers series;44 .
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>Y:5.1N45.N67s, K7/UN