Columbia subject headings:
Harvard subject headings:
Frankfurt am Main (Germany)--Biography
Frankfurt am Main (Germany)--History
Frankfurt am Main (Germany)--Social life and customs.
Müller, Paul, 1904-
Princeton subject headings:
Frankfurt am Main (Germany)--Biography.
Frankfurt am Main (Germany)--History.
Frankfurt am Main (Germany)--Social life and customs.
Müller, Paul, 1904-