Columbia subject headings:
Eastern Rumelia--History--Union with Bulgaria, 1885--Sources.
Serbo-Bulgarian War, 1885--Sources.
Harvard subject headings:
Eastern Rumelia--History--Union with Bulgaria, 1885--Sources.
Serbo-Bulgarian War, 1885--Sources.
Princeton subject headings:
Eastern Rumelia--History--Union with Bulgaria, 1885--Sources.
Serbo-Bulgarian War, 1885--Sources.