Columbia subject headings:
India--Civilization--To 1200.
Indo-Aryans--Origin.
Slavs--Origin.
Soviet Union--Civilization.
Harvard subject headings:
India--Civilization--To 1200
Indo-Aryans--Origin.
Slavs, Eastern--Civilization.
Slavs, Eastern--Origin.
Slavs--Origin.
Soviet Union--Civilization.
Princeton subject headings: