Columbia subject headings:
Russian language--Dialects--Lexicology--Congresses.
Russian language--Dialects--Maps--Congresses.
Russian language--Dialects--Research--Congresses.
Harvard subject headings:
Russian language--Dialects--Lexicology--Congresses.
Russian language--Dialects--Maps--Congresses.
Russian language--Dialects--Research--Congresses.
Princeton subject headings:
Russian language--Dialects--Lexicology--Congresses.
Russian language--Dialects--Maps--Congresses.
Russian language--Dialects--Research--Congresses.