Columbia subject headings:
Anna, Empress of Russia, 1693-1740.
Russia--History--Anna, 1730-1740.
Harvard subject headings:
Anna, Empress of Russia, 1693-1740.
Russia--History--Anna, 1730-1740.
Princeton subject headings:
Anna, Empress of Russia, 1693-1740.
Russia--History--Anna, 1730-1740.