Columbia subject headings:
Russia--Civilization--18th century--Congresses.
Russia--Intellectual life--18th century--Congresses.
Harvard subject headings:
Russia--Civilization--18th century--Congresses.
Russia--Intellectual life--18th century--Congresses.
Russia--Politics and government--1689-1801--Congresses.
Princeton subject headings:
Russia--Civilization--18th century--Congresses.
Russia--Intellectual life--18th century--Congresses.