Columbia subject headings:
Calendar--Russia (Federation)--Siberia.
Siberia (Russia)--Antiquities.
Stone age--Russia (Federation)--Siberia.
Harvard subject headings:
Calendar--Russia (Federation)--Russia (Federation)--Siberia.
Siberia (Russia)--Antiquities.
Stone age--Russia (Federation)--Russia (Federation)--Siberia.
Princeton subject headings: