Columbia subject headings:
Immigrants--United States--Encyclopedias.
United States--Emigration and immigration--Encyclopedias.
Harvard subject headings:
Immigrants--United States--Encyclopedias.
United States--Emigration and immigration--Encyclopedias.
Princeton subject headings:
Encyclopedias.
Immigrants--United States--Encyclopedias.
United States--Emigration and immigration--Encyclopedias.