Hybrid of File:Flag of Bulgaria.svg and File:Flag of Yugoslavia (1918–1941).svg.
Flag_of_Bulgaria.svg
Flag_of_Yugoslavia_(1918–1941).svg
Flag_of_Bulgaria.svg: see File:Flag of Bulgaria.svg#filehistory
Flag_of_Yugoslavia_(1918–1941).svg: see File:Flag_of_Yugoslavia_(1918–1941).svg#filehistory
derivative work: SenseiAC