Columbia subject headings:
Emigration and immigration--History--19th century.
Emigration and immigration--History--20th century.
Immigrants--Social conditions--19th century.
Immigrants--Social conditions--20th century.
Migration, Internal--History--19th century.
Migration, Internal--History--20th century.
Harvard subject headings:
Emigration and immigration--History--19th century.
Emigration and immigration--History--20th century.
Immigrants--Social conditions--19th century.
Immigrants--Social conditions--20th century.
Migration, Internal--History--19th century.
Migration, Internal--History--20th century.
Princeton subject headings:
Emigration and immigration--History--19th century.
Emigration and immigration--History--20th century.
Immigrants--Social conditions--19th century.
Immigrants--Social conditions--20th century.
Migration, Internal--History--19th century.
Migration, Internal--History--20th century.