Columbia subject headings:
Baltic Provinces (Russia)--Social conditions--Congresses.
Enlightenment--Russia (Federation)--Baltic Provinces--Congresses.
Harvard subject headings:
Baltic States--Intellectual life--18th century--Congresses.
Baltic States--Intellectual life--19th century--Congresses.
Enlightenment--Baltic States--Congresses.
Princeton subject headings:
Baltic States--Intellectual life--18th century--Congresses.
Baltic States--Intellectual life--19th century--Congresses.
Enlightenment--Baltic States--Congresses.