Columbia subject headings:
Bulgaria--Foreign relations--Yugoslavia.
Dimitrov, Georgi, 1882-1949.
Macedonian question.
Yugoslavia--Foreign relations--Bulgaria.
Harvard subject headings:
Bulgaria--Foreign relations--Yugoslavia.
Dimitrov, Georgi, 1882-1949.
Macedonian question.
Yugoslavia--Foreign relations--Bulgaria.
Princeton subject headings:
Bulgaria--Foreign relations--Yugoslavia.
Dimitrov, Georgi, 1882-1949.
Macedonian question.
Yugoslavia--Foreign relations--Bulgaria.