Columbia subject headings:
Harvard subject headings:
Bulgaria--Ethnic relations.
Bulgarians--Origin.
Greeks--Greece--Macedonia--Origin.
Macedonia (Greece)--Ethnic relations.
Thrace, Eastern (Turkey)--Ethnic relations.
Turks--Turkey--Thrace, Eastern--Origin.
Princeton subject headings:
Bulgaria--Ethnic relations.
Bulgarians--Origin.
Greeks--Origin.
Macedonia (Greece)--Ethnic relations.
Thrace, Eastern (Turkey)--Ethnic relations.
Turks--Origin.