The positive contribution by immigrants :  a symposium prepared for Unesco by the International Sociological Association and the International Economic Association. 

 - [Paris] :  Unesco,  [1960] 
 - [United Nations Educational, Scientific and Cultural Organization] Population and culture ;  3 .
 - Population and culture ;  3. .
<br/><br/>Includes bibliographies. 
<br/><br/><label>Subjects--Corporate Names: </label><br/>International Economic Association.
<br/><br/><label>Subjects--Topical Terms: </label><br/>Emigration and immigration.