Columbia subject headings:
Harvard subject headings:
Bulgaria--Relations--Yugoslavia--Serbia.
Bulgarian imprints--Yugoslavia--Serbia.
Publishers and publishing--Bulgaria--History--19th century.
Publishers and publishing--Yugoslavia--Serbia--History--19th century.
Serbia--Relations--Bulgaria.
Princeton subject headings:
Bulgaria--Relations--Yugoslavia--Serbia--History.
Bulgarian imprints--Yugoslavia--Serbia--History.
Press--Yugoslavia--Serbia--History.
Serbia--Relations--Bulgaria--History.