Columbia subject headings:
Russia--History--Period of Consolidation, 1462-1605.
Harvard subject headings:
Feudalism--Russia--History--16th century.
Feudalism--Russia--History.
Russia--History--Period of Consolidation, 1462-1605.
Russia--Kings and rulers--Genealogy.
Social classes--Soviet Union--History.
Princeton subject headings:
Feudalism--Russia--History--16th century.
Russia--History--Period of Consolidation, 1462-1605.
Russia--Kings and rulers--Genealogy.