Columbia subject headings:
Frankfurt am Main (Germany)--Commerce--History--Exhibitions.
Leipzig (Germany)--Commerce--History--Exhibitions.
Trade routes--Germany--History--Exhibitions.
Harvard subject headings:
Frankfurt am Main (Germany)--Commerce--History--Exhibitions.
Leipzig (Germany)--Commerce--History--Exhibitions.
Trade routes--Germany--History--Exhibitions.
Princeton subject headings:
Frankfurt am Main (Germany)--Commerce--History--Exhibitions.
Leipzig (Germany)--Commerce--History--Exhibitions.
Trade routes--Germany--History--Exhibitions.