Columbia subject headings:
Harvard subject headings:
Emigration and immigration
Ethnic relations
Germany--Ethnic relations.
Immigrants
Immigrants--Germany
Immigrants--Germany--Berlin.
Minorities
Minorities--Germany
Minorities--Germany--Berlin.
Noncitizens
Noncitizens--Germany
Noncitizens--Germany--Berlin.
Urbanization
Princeton subject headings:
Germany--Ethnic relations.
Immigrants--Germany.
Minorities--Germany.
Noncitizens--Germany.