Columbia subject headings:
Harvard subject headings:
German language--Dialects--Europe, Central--History--Congresses.
German language--Dialects--Europe, Eastern--History--Congresses.
German language--Europe, Central--History--Congresses.
German language--Europe, Eastern--History--Congresses.
Habsburg, House of--Congresses.
Multilingualism--Europe, Central--History--Congresses.
Multilingualism--Europe, Eastern--History--Congresses.
Sociolinguistics--Europe, Central--History--Congresses.
Sociolinguistics--Europe, Eastern--History--Congresses.
Princeton subject headings:
German language--Dialects--Europe, Central--History--Congresses.
German language--Dialects--Europe, Eastern--History--Congresses.
German language--Europe, Central--History--Congresses.
German language--Europe, Eastern--History--Congresses.
Habsburg, House of--Congresses.
Multilingualism--Europe, Central--History--Congresses.
Multilingualism--Europe, Eastern--History--Congresses.
Sociolinguistics--Europe, Central--History--Congresses.
Sociolinguistics--Europe, Eastern--History--Congresses.