Columbia subject headings:
Harvard subject headings:
Canada--Emigration and immigration--Government policy--History--20th century.
Citizenship--Government policy--Canada--History--20th century.
Citizenship--Government policy--Germany--History--20th century.
Emigration and immigration--Government policy--Canada--History--20th century.
Emigration and immigration--Government policy--Germany--History--20th century.
Germany--Emigration and immigration--Government policy--History--20th century.
Multiculturalism--Canada--History--20th century.
Multiculturalism--Germany--History--20th century.
Princeton subject headings:
Citizenship--Government policy--Canada--History--20th century.
Citizenship--Government policy--Germany--History--20th century.
Emigration and immigration--Government policy--Canada--History--20th century.
Emigration and immigration--Government policy--Germany--History--20th century.
Multiculturalism--Canada--History--20th century.
Multiculturalism--Germany--History--20th century.