Columbia subject headings:
Kievan Rus--History--862-1237--Historiography.
Turks--Russia--Historiography.
Harvard subject headings:
Kievan Rus--History--862-1237
Nomads--Russia--Historiography.
Nomads--Ukraine.
Ukraine--History--862-1240--Historiography.
Princeton subject headings:
Russia--History--To 1533--Historiography.
Turks--Soviet Union--Historiography.