Columbia subject headings:
Balto-Slavic linguistic unity.
Indo-European languages--History.
Indo-Europeans--History.
Languages in contact.
Proto-Slavic language--History.
Slavic languages--History.
Slavs--History.
Harvard subject headings:
Balto-Slavic linguistic unity.
Indo-European languages--History.
Indo-Europeans--History.
Languages in contact.
Proto-Slavic language--History.
Slavic languages--History.
Slavs--History.
Princeton subject headings: