Columbia subject headings:
Languages in contact--Slavic countries.
Pomaks--Language.
Silesians--Language.
Slavic languages--Dialects.
Slavic languages--Grammar, Historical.
Slavic languages--History.
Slavic languages--Usage.
Slavic literature, Eastern--History and criticism.
Slavic literature, Southern--History and criticism.
Harvard subject headings:
Languages in contact--Slavic countries.
Pomaks--Language.
Silesians--Language.
Slavic languages--Dialects.
Slavic languages--Grammar, Historical.
Slavic languages--History.
Slavic languages--Usage.
Slavic literature, Eastern--History and criticism.
Slavic literature, Southern--History and criticism.
Princeton subject headings:
Languages in contact--Slavic countries.
Pomaks--Language.
Silesians--Language.
Slavic languages--Dialects.
Slavic languages--Grammar, Historical.
Slavic languages--History.
Slavic languages--Usage.
Slavic literature, Eastern--History and criticism.
Slavic literature, Southern--History and criticism.