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Rila : Geogr. očerk
Deliradev, Pavel - 1956
Persistent link: https://www.econbiz.de/10002335220
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Problemi na političeskata istorija na Bulgarija
Christov, Chr. (ed.) - 1979
Persistent link: https://www.econbiz.de/10000006496
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Filosofsko-metodologičeski problemi na izgraždaneto na razvito socialističesko obštestvo
Vǔlov, Todor (contributor) - 1975
Persistent link: https://www.econbiz.de/10003139982
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Vŭprosi na razvitieto na elektrifikacijata v NR Bŭlgarija : Bŭlg. Akad. na naukite. Ikonom. Inst.
Šapkarev, Petǔr - 1963
Persistent link: https://www.econbiz.de/10002330382