Columbia subject headings:
Froi︠a︡nov, I. I︠A︡. (Igorʹ I︠A︡kovlevich)
Russia--Civilization.
Russia--History.
Harvard subject headings:
Russia--Civilization.
Russia--History.
Princeton subject headings:
Froi︠a︡nov, I. I︠A︡. (Igorʹ I︠A︡kovlevich)
Russia--Civilization.
Russia--History.