Columbia subject headings:
Atrocities--Bulgaria.
Bulgaria--Ethnic relations.
Civil rights--Bulgaria.
Turks--Bulgaria--History.
Harvard subject headings:
Atrocities--Bulgaria.
Bulgaria--Ethnic relations.
Turks--Bulgaria--History--19th century.
Turks--Bulgaria--History--20th century.
Princeton subject headings:
Atrocities--Bulgaria.
Bulgaria--Ethnic relations.
Civil rights--Bulgaria.
Turks--Bulgaria--History.