Demographic year book 1981 :  annuaire demographique / 

 - 33rd ed. 
 - New York :  United nations publication,  1983. 
 - 1111p. : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Year book
<br/><br/><label>Dewey Class. No.: </label>312.058  / DEM/D