Columbia subject headings:
German language--History--Congresses.
German language--Spoken German--Congresses.
German language--Written German--Congresses.
German poetry--History and criticism--Congresses.
Harvard subject headings:
German language--History--Congresses.
German language--Spoken German--Congresses.
German language--Written German--Congresses.
German poetry--History and criticism--Congresses.
Princeton subject headings:
German language--History--Congresses.
German language--Spoken German--Congresses.
German language--Written German--Congresses.
German poetry--History and criticism--Congresses.