Columbia subject headings:
Bulgaria--History--1878-1944.
Bulgaria--History--Autonomy and independence movements.
Committees.
Harvard subject headings:
Bulgaria--History--1878-1944.
Bulgaria--History--Autonomy and independence movements.
Committees
Princeton subject headings:
Bulgaria--History--1762-1878.
Bulgaria--History--Autonomy and independence movements.
Bulgaria--Relations--Russia.
Charities--Russia--History--19th century.
Russia--Relations--Bulgaria.