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Perspektivite na čoveka : Opit za kompleksno izsledvane na problema diskusii i obobščenija
Frolov, Ivan Timofeevič - 1981
Persistent link: https://www.econbiz.de/10002177454
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Futurologija i prognostika
Gančev, Petko - 1973
Persistent link: https://www.econbiz.de/10002269694
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Futurologija i filosofija
Cekov, Dimităr - 1980 - 1. izd
Persistent link: https://www.econbiz.de/10002312736
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Socialna promjana i obštestven progres : sbornik studii
Dobrijanov, Veličko Simeonov (contributor) - 1981
Persistent link: https://www.econbiz.de/10003242319
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Globalnite promeni i sădbata na Bălgarija prez 21 vek
Kacarski, Ivan (ed.); Todorova, Bogdana (ed.);  … - 2016 - Părvo izdanie
Persistent link: https://www.econbiz.de/10011595560