Columbia subject headings:
Caucasus--Boundaries--Sources.
Caucasus--Historical geography--Sources.
Caucasus--Maps.
Maps.
Harvard subject headings:
Caucasus--Boundaries--History.
Caucasus--Boundaries--Sources.
Caucasus--Historical geography--Sources.
Caucasus--Historical geography.
Caucasus--Maps.
Princeton subject headings:
Caucasus--Boundaries--History.
Caucasus--Historical geography.