Columbia subject headings:
Bulgaria--Emigration and immigration--History--19th century--Sources.
Bulgaria--Emigration and immigration--History--20th century--Sources.
Bulgarians--Foreign countries--History--19th century--Sources.
Bulgarians--Foreign countries--History--20th century--Sources.
Immigrants--History--19th century--Sources.
Immigrants--History--20th century--Sources.
Harvard subject headings:
Bulgaria--Emigration and immigration--History--Sources.
Bulgarians--Foreign countries.
Bulgarians--Turkey--Government relations.
Refugees, Bulgarian--History--Sources.
Princeton subject headings: