Columbia subject headings:
Poland--Intellectual life--1795-1918--Congresses.
Poland--Intellectual life--To 1795--Congresses.
Poland--Relations--Soviet Union.
Soviet Union--Relations--Poland.
Harvard subject headings:
Poland--Intellectual life--1795-1918--Congresses.
Poland--Intellectual life--To 1795--Congresses.
Poland--Relations--Soviet Union--Congresses.
Soviet Union--Relations--Poland--Congresses.
Princeton subject headings:
Poland--Intellectual life--1795-1918--Congresses.
Poland--Intellectual life--To 1795--Congresses.
Poland--Relations--Russia--Congresses.
Russia--Relations--Poland--Congresses.