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Priroda i resursi
Mišev, Kiril (revision) - 1989
Persistent link: https://www.econbiz.de/10000805853
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Gorite i gorskoto stopanstvo v Bŭlgarii︠a︡
Petkov, Ĭordan Zafirov - 1963
Persistent link: https://www.econbiz.de/10003025138
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Goritě i gorskoto stopanstvo v Bǔlgarija 1879-1912 : S 31 obrazi v teksta
Brǔnčev, Stojan - 1918
Persistent link: https://www.econbiz.de/10001960206