Columbia subject headings:
German language--Germany (East)--Congresses.
German language--Germany (West)--Congresses.
German language--Political aspects--Congresses.
German language--Social aspects--Congresses.
German language--Variation--Congresses.
Germany--History--Unification, 1990--Congresses.
Harvard subject headings:
German language--Germany (East)--Usage--History--Congresses.
German language--Germany (West)--Usage--History--Congresses.
German language--Political aspects--Congresses.
Princeton subject headings:
German language--Germany (East)--Congresses.
German language--Germany (West)--Congresses.
German language--Political aspects--Congresses.
German language--Social aspects--Congresses.
German language--Variation--Congresses.
Germany--History--Unification, 1990--Congresses.