Columbia subject headings:
Ivan VI Antonovich, Emperor of Russia, 1740-1764.
Russia--History--Ivan VI, 1740-1741.
Russia--Kings and rulers--Biography.
Harvard subject headings:
Princeton subject headings:
Emperors--Russia--Biography.
Ivan VI Antonovich, Emperor of Russia, 1740-1764.
Russia--History--Ivan VI, 1740-1741.