Columbia subject headings:
Harvard subject headings:
Counterrevolutionaries--Soviet Union--Biography.
Ėfron, Sergeĭ, 1893-1941
Soviet Union--History--Revolution, 1917-1921--Personal narratives, Russian.
Soviet Union--History--Revolution, 1917-1921--Protest movements.
Princeton subject headings:
Ėfron, Sergeĭ, 1893-1941.