Columbia subject headings:
German language--History--Congresses.
German language--Study and teaching--History--Congresses.
Historical linguistics--Germany--Congresses.
Harvard subject headings:
German language--History--Congresses.
German language--Study and teaching--History--Congresses.
Historical linguistics--Germany--Congresses.
Princeton subject headings:
German language--History--Congresses.
German language--Study and teaching--History--Congresses.
Historical linguistics--Germany--Congresses.