Columbia subject headings:
Harvard subject headings:
German language--Grammar--Study and teaching--Congresses.
German language--Problems, exercises, etc.--Congresses.
German language--Study and teaching--Foreign speakers--Congresses.
Princeton subject headings:
German language--Grammar--Study and teaching--Congresses.
German language--Problems, exercises, etc.--Congresses.
German language--Study and teaching--Foreign speakers--Congresses.