Columbia subject headings:
Harvard subject headings:
Emigration and immigration--History--Congresses.
Emigration and immigration--Social aspects--Congresses
Immigrant families--History--Congresses.
Immigrant families--Social aspects--Congresses.
Transnationalism--History--Congresses.
Transnationalism--Social aspects--Congresses.
Princeton subject headings:
Emigration and immigration--Social aspects.
Immigrant families.
Transnationalism.