Columbia subject headings:
Harvard subject headings:
Foreign workers--Germany--History--Exhibitions.
Foreign workers--History--Exhibitions.
Migrant labor--Germany--History--Exhibitions.
Migrant labor--History--Exhibitions.
Princeton subject headings:
Foreign workers--Germany--History--Exhibitions.
Foreign workers--History--Exhibitions.
Migrant labor--Germany--History--Exhibitions.
Migrant labor--History--Exhibitions.