Columbia subject headings:
Emigration and immigration law--United States--Congresses.
United States--Emigration and immigration--Congresses.
Harvard subject headings:
Emigration and immigration law--United States--Congresses.
United States--Emigration and immigration--Congresses.
Princeton subject headings:
Emigration and immigration law--United States--Congresses.
United States--Emigration and immigration--Congresses.