Columbia subject headings:
Communism and society--Congresses.
Imperialism--Congresses.
Russia--History--1801-1917--Congresses.
Russia--Politics and government--1801-1917--Congresses.
Soviet Union--History--Congresses.
Harvard subject headings:
Russia--History--Congresses.
Soviet Union--History--Congresses.
Princeton subject headings:
Russia--History--Congresses.
Soviet Union--History--Congresses.