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

 - [Paris] :   Unesco,   [1955]. 
 - 202 p. :    ill., tables ;    22 cm. 
 - United Nations Educational, Scientific and Cultural Organization. Po pulation and culture;   3. .
<br/><br/>Includes bibliographical references 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Emigration and immigration.--------
<br/><br/><label>Dewey Class. No.: </label>325.1