United Nations, Department of Economic and Social Affairs. <br/><br/>
Sample surveys of Current Interest  (Twelfth Report) . 

 - New York  United Nations  1973 
 - xv, 477p. 
 - United Nations Statistical Papers Series C .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Demography<br/>Population Survey<br/>Sample Surveys