Columbia subject headings:
Nicholas I, Emperor of Russia, 1796-1855--Sources.
Russia--History--Nicholas I, 1825-1855--Sources.
Harvard subject headings:
Nicholas I, Emperor of Russia, 1796-1855--Sources.
Russia--History--Nicholas I, 1825-1855--Sources.
Princeton subject headings:
Nicholas I, Emperor of Russia, 1796-1855.
Russia--History--December Uprising, 1825.
Russia--History--Nicholas I, 1825-1855.