Columbia subject headings:
Harvard subject headings:
Duisburg (Germany)--Cultural policy.
Duisburg (Germany)--History--20th century.
Duisburg (Germany)--History--21st century.
Duisburg (Germany)--Social conditions.
Princeton subject headings:
Duisburg (Germany)--Cultural policy.
Duisburg (Germany)--Social conditions.
Germany--History--1945-
Politics and culture--Germany--Duisburg.