Columbia subject headings:
Harvard subject headings:
Art--Collectors and collecting--Germany--Frankfurt am Main--Exhibitions.
Collectors and collecting--Germany--Frankfurt am Main--Exhibitions.
Foreign workers--Germany--Frankfurt am Main--Exhibitions.
Frankfurt am Main (Germany)--History--Exhibitions.
Historisches Museum Frankfurt am Main--Exhibitions.
Sociology, Urban--Germany--Frankfurt am Main--Exhibitions.
Princeton subject headings:
Foreign workers--Germany--History--Exhibitions.
Germany--Emigration and immigration--History--Exhibitions.
Migrant labor--Germany--History--Exhibitions.