Columbia subject headings:
Harvard subject headings:
Industrial relations--Germany--Saxony--History--Congresses.
Industrial relations--Germany--Saxony-Anhalt--History--Congresses.
Industrial relations--Germany--Thuringia--History--Congresses.
Work environment--Germany--History--Congresses.
Princeton subject headings:
Industrial relations--Germany--Saxony--History--Congresses.
Industrial relations--Germany--Thuringia--History--Congresses.