Columbia subject headings:
Harvard subject headings:
Germany--Politics and government--20th century--Exhibitions.
Labor movement--Germany--Palatinate--History--20th century--Exhibitions.
Princeton subject headings:
Germany--Politics and government--20th century--Exhibitions.
Labor movement--Germany--Biography--Exhibitions.
Labor movement--Germany--Palatinate--History--20th century--Exhibitions.
National socialism--Germany--Palatinate--History--Exhibitions.