Columbia subject headings:
Harvard subject headings:
Berlin (Germany)--History
Berlin (Germany)--History--Bibliography.
Brandenburg (Germany : State)--History
Brandenburg (Germany : State)--History--Bibliography.
Historische Kommission zu Berlin
Princeton subject headings:
Berlin (Germany)--History--Bibliography.
Berlin (Germany)--History.
Brandenburg (Germany : State)--History--Bibliography.
Brandenburg (Germany : State)--History.
Historische Kommission zu Berlin.