Columbia subject headings:
Cities and towns--Europe, Central--History--20th century--Congresses.
Cities and towns--Europe, Eastern--History--20th century--Congresses.
Cities and towns--Germany--History--20th century--Congresses.
War--History--20th century--Congresses.
Harvard subject headings:
Cities and towns--Europe, Central--History--20th century--Congresses.
Cities and towns--Europe, Eastern--History--20th century--Congresses.
Cities and towns--Germany--History--20th century--Congresses.
War--History--20th century--Congresses.
Princeton subject headings:
Cities and towns--Europe, Central--History--20th century--Congresses.
Cities and towns--Europe, Eastern--History--20th century--Congresses.
Cities and towns--Germany--History--20th century--Congresses.
War--History--20th century--Congresses.