Columbia subject headings:
Slavic languages--History--Congresses.
Slavic philology--History--Congresses.
Slavs--History--Congresses.
Harvard subject headings:
Slavic languages--History--Congresses.
Slavic philology--History--Congresses.
Slavs--History--Congresses.
Princeton subject headings:
Slavic languages--History--Congresses.
Slavic philology--History--Congresses.
Slavs--History--Congresses.