Columbia subject headings:
Circassians--History.
Russia--Ethnic relations--History.
Russia--History.
Soviet Union--Ethnic relations--History.
Soviet Union--History.
Tatars--History.
Harvard subject headings:
Circassians--History.
Russia--Ethnic relations.
Russia--History.
Soviet Union--Ethnic relations.
Soviet Union--History.
Tatars--History
Princeton subject headings:
Russia--History.
Soviet Union--History.