Columbia subject headings:
Russian language--Dialects--Poland--Congresses.
Slavic languages, Western--Dialects--Congresses.
Harvard subject headings:
Russian language--Dialects--Poland--Congresses.
Slavic languages, Western--Dialects--Congresses.
Princeton subject headings:
Russian language--Dialects--Poland--Congresses.
Slavic languages, Western--Dialects--Congresses.