Columbia subject headings:
Epic poetry, Russian--History and criticism.
Epic poetry--Russia (Federation)--Volga River Region--History and criticism.
Harvard subject headings:
Chuvash poetry--History and criticism.
Epic poetry--History and criticism
Epic poetry--Russia (Federation)--Volga River Region--History and criticism.
Mari poetry--History and criticism.
Mordvin poetry--History and criticism.
Princeton subject headings: