Columbia subject headings:
Bells--Germany--Frankfurt am Main--History.
Bells--Germany--Hesse--History.
Bells--History.
Frankfurt am Main (Germany)--Social life and customs.
Hesse (Germany)--Social life and customs.
Harvard subject headings:
Bells--Germany--Frankfurt am Main--History.
Bells--Germany--Hesse--History.
Bells--History.
Frankfurt am Main (Germany)--Social life and customs.
Hesse (Germany)--Social life and customs.
Princeton subject headings:
Bells--Germany (West)--Frankfurt am Main--Exhibitions.