Columbia subject headings:
Municipal home rule--Germany--North Rhine-Westphalia--History--20th century.
North Rhine-Westphalia (Germany)--Politics and government--20th century.
State-local relations--Germany--North Rhine-Westphalia--History--20th century.
Harvard subject headings:
Local government--Germany--North Rhine-Westphalia--History--20th century.
North Rhine-Westphalia (Germany)--Politics and government--20th century.
Princeton subject headings: