Columbia subject headings:
Harvard subject headings:
Caucasian languages--Congresses.
Caucasus--Civilization--Congresses.
Languages in contact--Caucasus--Congresses.
Sociolinguistics--Caucasus--Congresses.
Princeton subject headings:
Caucasian languages--Congresses.
Caucasus--Civilization--Congresses.
Languages in contact--Caucasus--Congresses.
Sociolinguistics--Caucasus--Congresses.