Columbia subject headings:
Bati͡ushin, Nikolaĭ Stepanovich, 1874-1957.
Intelligence officers--Russia--Biography.
Intelligence service--Russia.
Soviet Union--History--Revolution, 1917-1921--Secret service.
World War, 1914-1918--Secret service--Russia.
Harvard subject headings:
Military art and science--Russia--History--20th century.
World War, 1914-1918--Russia
Princeton subject headings:
Intelligence service--Russia--History.
World War, 1914-1918--Secret service.