Columbia subject headings:
Constitutional history--Germany--North Rhine-Westphalia.
North Rhine-Westphalia (Germany)--Politics and government.
Harvard subject headings:
Constitutional history--Germany--North Rhine-Westphalia.
North Rhine-Westphalia (Germany)--Politics and government.
Princeton subject headings:
Constitutional history--Germany--North Rhine-Westphalia.
North Rhine-Westphalia (Germany)--Politics and government.