Columbia subject headings:
German language--Europe, Central--Congresses.
German language--Europe, Eastern--Congresses.
Harvard subject headings:
German language--Balkan Peninsula--Congresses.
German language--Europe, Central--Congresses.
German language--Europe, Eastern--Congresses.
German language--Study and teaching--Balkan Peninsula--Congresses.
German language--Study and teaching--Europe, Central--Congresses.
German language--Study and teaching--Europe, Eastern--Congresses.
Language and culture--Congresses.
Second language acquisition--Congresses.
Princeton subject headings:
German language--Europe, Central--Congresses.
German language--Europe, Eastern--Congresses.