Columbia subject headings:
German language--Study and teaching--Foreign speakers--Congresses.
German language--Study and teaching--Polish speakers--Congresses.
Harvard subject headings:
German language--Study and teaching--Foreign speakers--Congresses.
German language--Study and teaching--Polish speakers--Congresses.
Princeton subject headings:
German language--Study and teaching--Foreign speakers--Congresses.
German philology--Congresses.