Columbia subject headings:
Harvard subject headings:
Sytin, S. L. (Sergeĭ Lʹvovich)--Congresses.
Volga River Valley (Russia)--Biography--Congresses.
Volga River Valley (Russia)--History--Congresses.
Princeton subject headings:
Sytin, S. L. (Sergeĭ Lʹvovich)--Congresses.
Volga River Valley (Russia)--Biography--Congresses.
Volga River Valley (Russia)--History--Congresses.