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Ikonomičeski polzi ot opazvaneto na bioraznoobrazieto (na primera na bălgarskite dunavski ostrovi)
Dančev, Aleksi - In: Ikonomičeska misăl 47 (2002) 4, pp. 41-66
Persistent link: https://www.econbiz.de/10001691793
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Biogeografija i priroden kapital na Bălgarija
Asenov, Asen - 2021
Persistent link: https://www.econbiz.de/10012608068
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Političeskata vlast v stranite săs socialističeska orientacija : metodologičeski problemi
Stojanova, Stanka D. - 1985
Persistent link: https://www.econbiz.de/10000698679
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Svetovnoto stopanstvo se prekrojava
Popov, Nikola - 2003 - 2. preraboteno i dop. izd.
Persistent link: https://www.econbiz.de/10002363528