Columbia subject headings:
Berlin (Germany)--History.
London (England)--History--1800-1950.
Paris (France)--History.
World War, 1914-1918--England--London.
World War, 1914-1918--France--Paris.
World War, 1914-1918--Germany--Berlin.
Harvard subject headings:
Berlin (Germany)--History
London (England)--History--1800-1950.
Paris (France)--History.
World War, 1914-1918--England--London.
World War, 1914-1918--France--Paris
World War, 1914-1918--Germany--Berlin.
Princeton subject headings:
Berlin (Germany)--History.
London (England)--History.
Paris (France)--History.
World War, 1914-1918--England--London.
World War, 1914-1918--France--Paris.
World War, 1914-1918--Germany--Berlin.