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Bulgaria - Wikipedia
Bulgaria | History, Language, Map, & Points of Interest
Bulgaria Maps & Facts - World Atlas
Bulgaria country profile - BBC News
Bulgaria travel - Lonely Planet | Europe
15 Best Places to Visit in Bulgaria - The Crazy Tourist
Bulgaria Travel - Visit, Discover & Live An Unforgettable Journey
Bulgaria - World Factbook Glyph
Bulgaria - Simple English Wikipedia, the free encyclopedia
Bulgaria – Travel guide at Wikivoyage