Columbia subject headings:
Harvard subject headings:
America--Emigration and immigration--Economic aspects--Congresses.
America--Emigration and immigration--Social aspects--Congresses.
Emigration and immigration law--America--Congresses.
Human rights--America--Congresses.
Princeton subject headings:
America--Emigration and immigration--Economic aspects--Congresses.
America--Emigration and immigration--Social aspects--Congresses.
Emigration and immigration law--America--Congresses.
Human rights--America--Congresses.