Columbia subject headings:
Bulgarians--Greece--History.
Bulgarians--Romania--History.
Greece--History--War of Independence, 1821-1829--Participation, Bulgarian.
Moldavia--History.
Wallachia--History.
Harvard subject headings:
Bulgarians--Greece--History.
Bulgarians--Romania--History.
Greece--History--War of Independence, 1821-1829--Participation, Bulgarian.
Moldavia--History.
Wallachia--History.
Princeton subject headings: