Columbia subject headings:
Harvard subject headings:
Housing--Germany--History--Congresses.
Urbanization--Germany (West)--Congresses.
Urbanization--Germany--Congresses.
Urbanization--Switzerland--Congresses.
Princeton subject headings:
Cities and towns--Germany--History--Congresses.
Germany--Social conditions--Congresses.
Housing--Germany--History--Congresses.
Urbanization--Germany--History--Congresses.