Columbia subject headings:
Caucasian languages--Grammar, Comparative.
Caucasian languages--Phonology, Comparative.
Circassian languages--Grammar, Comparative.
Circassian languages--Phonology, Comparative.
Harvard subject headings:
Abkhazo-Adyghian languages.
Circassian languages.
Grammar, Comparative and general.
Linguistics.
Princeton subject headings: