- What Do I Know About Bulgaria? by Una Pride, 1995-11-30
- Caves and Speleology in Bulgaria by Petar Beron, Trifon Daaliev, et all 2006-11-30
- Bulgaria in the European Cartographic Concepts Until XIX Century by Atanas Orachev, 2005-04-30
- Bulgaria: Webster's Timeline History, 71 BC - 2003 by Icon Group International, 2010-05-17
- Bulgaria: Webster's Timeline History, 2004 - 2007 by Icon Group International, 2010-05-17
- Human Dimensions of Global Change in Bulgaria: First International Conference
- The ecology of malnutrition in central and south-eastern Europe: Austria, Hungary, Rumania, Bulgaria, Czechoslovakia (Studies in medical geography;vol.6; United States) by Jacques Mayer May, 1966
- Ecology of Malnutrition in Central and Southern Europe, Austria, Hungary, Romania, Bulgaria, and Czechoslovakia (Studies in Medical Geography) by Jacques M. May, 1966-06
- Bulgaria (Major World Nations) by Julian Popescu, 2000-01
- The ecology of malnutrition in central and southeastern Europe: Austria, Hungary, Rumania, Bulgaria, Czechoslovakia (His Studies in medical geography, v. 6) by Jacques M May, 1966
- Bulgaria: Known & Unknown by Viara Kandjeva, Antoniy Handjiyski, 2004-09-30
- Turkish resettlement of Bulgarian Turks, 1950-1953 (University of California, Berkeley. University of California publications in geography) by Huey Louis Kostanick, 1957
- Sokolnik - Bulgaria
- Vidin: Bulgarian Language, List of Cities and Towns in Bulgaria, Danube, Bulgaria, Serbia, Romania, Vidin Province, Calafat, Calafat?Vidin Bridge
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