Columbia subject headings:
Cherepnin, L. V. (Lev Vladimirovich)--Congresses.
Feudalism--Soviet Union--Congresses.
Historians--Soviet Union--Congresses.
Russia--History--To 1533--Congresses.
Harvard subject headings:
Cherepnin, L. V. (Lev Vladimirovich),--Congresses.
Cherepnin, L. V. (Lev Vladimirovich).
Feudalism--Russia--Congresses.
Historians--Soviet Union--Congresses.
Russia--History--To 1533--Congresses.
Princeton subject headings: