Columbia subject headings:
Harvard subject headings:
Civilization, Slavic.
Kievan Rus--History.
Russia--Civilization.
Russia--History.
Rybakov, Boris Aleksandrovich, 1908-
Princeton subject headings:
Civilization, Slavic.
Kievan Rus--History.
Russia--Civilization.
Russia--History.
Rybakov, B. A. (Boris Aleksandrovich), 1908-2001.