Columbia subject headings:
Fairs--Germany--Frankfurt am Main--History.
Frankfurt am Main (Germany)--Economic conditions.
Industries--Germany--Frankfurt am Main--History.
Harvard subject headings:
Fairs--Germany--Frankfurt am Main--History.
Frankfurt am Main (Germany)--Commerce--History.
Princeton subject headings:
Fairs--Germany--Frankfurt am Main--History.
Frankfurt am Main (Germany)--Economic conditions.
Industries--Germany--Frankfurt am Main--History.