National policy criteria in a world with international migration / 
by R. Albert Berry and Ronald Soligo. 
 - Houston :  Rice University,  1970. 
 - 25p. ;  29 cm. 
 - Program of education studies ;  paper no.7 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Emigration and immigration--Economic aspects--Mathematics models.