Columbia subject headings:
Feudalism--Russia (Federation)--Siberia--History--Sources.
Siberia (Russia)--History--Sources.
Harvard subject headings:
Feudalism--Russia (Federation)--Siberia--History--Sources.
Siberia (Russia)--History--Sources.
Princeton subject headings:
Feudalism--Russia (Federation)--Siberia--History--Sources.
Siberia (Russia)--History--Sources.