Columbia subject headings:
Harvard subject headings:
German language--Congresses.
German literature--History and criticism--Congresses
German philology--Congresses.
Literature and society--Congresses.
Literature--History and criticism--Congresses.
Sociolinguistics--Congresses.
Princeton subject headings:
German language--Congresses.
German literature--History and criticism--Congresses.
Literature and society--Congresses.
Literature--History and criticism--Congresses.
Sociolinguistics--Congresses.