Columbia subject headings:
Guchkov, Aleksandr Ivanovich, 1862-1936.
Soviet Union--Biography.
Trotsky, Leon, 1879-1940.
Vernadskiĭ, V. I. (Vladimir Ivanovich), 1863-1945.
Harvard subject headings:
Guchkov, Aleksandr Ivanovich, 1862-1936
Soviet Union--Biography.
Trotsky, Leon, 1879-1940
Vernadskiĭ, V. I. (Vladimir Ivanovich), 1863-1945.
Princeton subject headings:
Revolutionaries--Russia--Biography.
Russia--History--Nicholas II, 1894-1917--Biography.