Columbia subject headings:
Kalinin, M. I. (Mikhail Ivanovich), 1875-1946.
Tverskai︠a︡ oblastʹ (Russia)--History.
Volga River Valley (Russia)--History.
Harvard subject headings:
Kalinin, M. I. (Mikhail Ivanovich), 1875-1946.
Tverskai︠a︡ oblastʹ (Russia)--History.
Volga River Valley--History.
Princeton subject headings:
Kalinin, M. I. (Mikhail Ivanovich), 1875-1946.
Tverskai︠a︡ oblastʹ (Russia)--History.
Volga River Valley (Russia)--History.