Columbia subject headings:
Russia--Social conditions--Congresses.
Russia--Social life and customs--Congresses.
Soviet Union--Social conditions--Congresses.
Soviet Union--Social life and customs--Congresses.
Harvard subject headings:
Russia--Social conditions--Congresses.
Russia--Social life and customs--Congresses.
Soviet Union--Social conditions--Congresses.
Soviet Union--Social life and customs--Congresses.
Princeton subject headings:
Russia--Social conditions--Congresses.
Russia--Social life and customs--Congresses.
Soviet Union--Social conditions--Congresses.
Soviet Union--Social life and customs--Congresses.