Columbia subject headings:
Bulgaria--Emigration and immigration.
Bulgaria--Ethnic relations.
Forced migration--Bulgaria--History--20th century.
Immigrants--Turkey--History--20th century.
Turkey--Emigration and immigration.
Turks--Bulgaria--Ludogorie.
Turks--Government policy--Bulgaria--History.
Turks--Relocation--Bulgaria.
Harvard subject headings:
Bulgaria--Emigration and immigration.
Bulgaria--Ethnic relations
Forced migration--Bulgaria--History--20th century.
Immigrants--Turkey--History--20th century.
Turkey--Emigration and immigration
Turks--Bulgaria--Ludogorie.
Turks--Government policy--Bulgaria--History.
Turks--Relocation--Bulgaria.
Princeton subject headings:
Bulgaria--Emigration and immigration.
Bulgaria--Ethnic relations.
Forced migration--Bulgaria--History--20th century.
Immigrants--Turkey--History--20th century.
Turkey--Emigration and immigration.
Turks--Bulgaria--Ludogorie.
Turks--Bulgaria--Relocation .
Turks--Government policy--Bulgaria--History.