Columbia subject headings:
Russia--History--1237-1480.
Russia--History--1533-1613.
Harvard subject headings:
Russia--History--1237-1480.
Russia--History--1533-1613.
Princeton subject headings:
Feudalism--Russia.
Halyt︠s︡ʹko-Volynsʹke kni︠a︡zivstvo--History.
Russia--History--1237-1480.
Russia--History--1533-1613.
Smolenskoe kni︠a︡zhestvo--History.