Columbia subject headings:
Harvard subject headings:
Bulgaria--Antiquities.
Inscriptions, Cyrillic--Bulgaria--Preslav.
Inscriptions, Glagolitic--Bulgaria--Preslav.
Preslav (Bulgaria)--Antiquities.
Princeton subject headings:
Bulgaria--Antiquities.
Inscriptions, Cyrillic--Bulgaria--Preslav.
Inscriptions, Glagolitic--Bulgaria--Preslav.
Preslav (Bulgaria)--Antiquities.