Columbia subject headings:
Slavs--Balkan Peninsula--Congresses.
Slavs--Europe, Western--Congresses.
Harvard subject headings:
Slavic countries--Languages--Congresses.
Slavic languages--Europe, Western--Congresses.
Slavic philology--History--Congresses.
Slavs--Balkan Peninsula--Languages--Congresses.
Slavs--Europe, Central--Languages--Congresses.
Slavs--Europe, Eastern--Languages--Congresses.
Princeton subject headings:
Philologists--Europe--History--Congresses.
Slavic philology--History--Congresses.
Slavists--Europe--History--Congresses.