Columbia subject headings:
Harvard subject headings:
German language--Foreign countries--Congresses.
German language--Variation--Foreign countries--Congresses.
Languages in contact--Foreign countries--Congresses.
Sociolinguistics--Foreign countries--Congresses.
Princeton subject headings:
German language--Foreign countries--Congresses.
German language--Variation--Foreign countries--Congresses.
Languages in contact--Foreign countries--Congresses.
Sociolinguistics--Foreign countries--Congresses.