Columbia subject headings:
Harvard subject headings:
Balkan Peninsula--Politics and government--19th century.
Bulgaria--Foreign relations--Russia.
Bulgaria--History--Ferdinand I, 1887-1918.
Russia--Foreign relations--Bulgaria.
Princeton subject headings:
Bulgaria--Foreign relations--Russia.
Bulgaria--History--Ferdinand I, 1887-1918.
Bulgaria--Politics and government--1878-1944.
Russia--Foreign relations--Bulgaria.
Stambolov, Stefan, 1854-1895.