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Flag of Bulgaria - Wikipedia
Flag of Bulgaria | Meaning, Colors & Design | Britannica
Flags, Symbols & Currency of Bulgaria - World Atlas
Flag of Bulgaria | Flagpedia.net
Flag of Bulgaria - Simple English Wikipedia, the free encyclopedia
All About The Bulgarian Flag and It's History and Origin
World Factbook Glyph
National symbols of Bulgaria - Wikipedia
The National Flag of the Republic of Bulgaria - gov.bg
Flag of Bulgaria: history, colours, symbols and their meaning