Columbia subject headings:
Bulgaria--Imprints--Catalogs.
Publishers' catalogs--Bulgaria.
Sofiĭski universitet "Kliment Okhridski"--Catalogs.
Harvard subject headings:
Bulgaria--Imprints--Catalogs.
Publishers' catalogs--Bulgaria.
Sofiĭski universitet "Kliment Okhridski"--Catalogs.
Princeton subject headings:
Bulgaria--Imprints--Catalogs.
Publishers' catalogs--Bulgaria.
Sofiĭski universitet "Kliment Okhridski"--Catalogs.