Columbia subject headings:
Harvard subject headings:
Cities and towns--Germany--History
Cities and towns--Netherlands--History.
Religious communities--Germany--History.
Religious communities--Netherlands--History.
Princeton subject headings:
Cities and towns--Germany--North Rhine-Westphalia--History--Congresses.
Dioceses--Germany--North Rhine-Westphalia--History--Congresses.
North Rhine-Westphalia (Germany)--Social conditions--Congresses.
Social history--Medieval, 500-1500--Congresses.