Columbia subject headings:
Harvard subject headings:
Comparative education.
Education--Bulgaria--History--18th century.
Education--Bulgaria--History--19th century.
Education--Greece--History--18th century.
Education--Greece--History--19th century
Princeton subject headings:
Comparative education.
Education--Bulgaria--History--18th century.
Education--Bulgaria--History--19th century.
Education--Greece--History--18th century.
Education--Greece--History--19th century.