Columbia subject headings:
Harvard subject headings:
Germany--History--Unification, 1990--Congresses.
Labor unions--Germany (East)--History--Congresses.
Labor unions--Germany (West)--History--Congresses.
Labor unions--Government policy--Germany (East)--History--Congresses.
Labor unions--Government policy--Germany (West)--History--Congresses.
Labor unions--Political activity--Germany (East)--History--Congresses.
Labor unions--Political activity--Germany (West)--History--Congresses.
Princeton subject headings:
Labor unions--Germany.