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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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Filosofija na izkustvoto : s priloženie za otnošenieto na izobrazitelnite izkustva k"m prirodata
Schelling, Friedrich Wilhelm Joseph von - 1980
Persistent link: https://www.econbiz.de/10001744477