Columbia subject headings:
Emigration and immigration--Economic aspects.
Emigration and immigration--Social aspects.
Migration, Internal--Economic aspects.
Migration, Internal--Social aspects.
Harvard subject headings:
Emigration and immigration--Economic aspects
Emigration and immigration--Social aspects
Migration, Internal--Economic aspects.
Migration, Internal--Social aspects.
Princeton subject headings:
Emigration and immigration--Economic aspects.
Emigration and immigration--Social aspects.
Migration, Internal--Economic aspects.
Migration, Internal--Social aspects.