Columbia subject headings:
Russia--History--Alexander I, 1801-1825.
Russia--History--Catherine II, 1762-1796.
Russia--History--Paul I, 1796-1801.
Harvard subject headings:
Russia--History--Alexander I, 1801-1825.
Russia--History--Catherine II, 1762-1796.
Russia--History--Paul I, 1796-1801.
Princeton subject headings: