Columbia subject headings:
Russian language--Political aspects--Europe, Eastern--Congresses.
Russian language--Social aspects--Europe, Eastern--Congresses.
Russification--Europe, Eastern--Congresses.
Harvard subject headings:
Language policy--Russia (Federation)--History--Congresses.
Language policy--Russia--History--Congresses.
Language policy--Soviet Union--History--Congresses.
Russian language--Political aspects--Europe, Eastern--History--Congresses.
Russian language--Social aspects--Europe, Eastern--History--Congresses.
Russification--Europe, Eastern--History--19th century--Congresses.
Russification--Europe, Eastern--History--20th century--Congresses.
Princeton subject headings:
Russian language--Political aspects--Europe, Eastern--Congresses.
Russian language--Social aspects--Europe, Eastern--Congresses.
Russification--Europe, Eastern--Congresses.