Columbia subject headings:
Hungary--Foreign relations--Soviet Union.
Hungary--History--1849-1867.
Nicholas I, Emperor of Russia, 1796-1855.
Russia--History--Nicholas I, 1825-1855.
Soviet Union--Foreign relations--Hungary.
Harvard subject headings:
Hungary--Foreign relations--Russia.
Hungary--Foreign relations--Soviet Union.
Hungary--History--1849-1867
Nicholas I, Emperor of Russia, 1796-1855.
Russia--Foreign relations--Hungary.
Russia--History--Nicholas I, 1825-1855.
Soviet Union--Foreign relations--Hungary.
Princeton subject headings:
Hungary--Foreign relations--Russia.
Hungary--History--1849-1867.
Nicholas I, Emperor of Russia, 1796-1855.
Russia--Foreign relations--Hungary.
Russia--History--Nicholas I, 1825-1855.