Columbia subject headings:
Feudalism--Russia.
Kievan Rus--History--862-1237.
Land tenure--Russia.
Princes--Russia.
Harvard subject headings:
Feudalism--Russia.
Feudalism--Soviet Union.
Kievan Rus--History.
Land tenure--Russia.
Land tenure--Soviet Union
Russia--History--To 1533.
Princeton subject headings:
Feudalism--Soviet Union.
Kievan Rus--History--862-1237.
Kievan Rus--Princes and princesses.
Land tenure--Soviet Union.