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Neft i gaz
Jovčev, Jovčo Sm.; Baluchovski, N. F. - 1961
Persistent link: https://www.econbiz.de/10000595581
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Stratigrafija na Bălgarija
Čankov, Vasil (contributor); Spasov, Christo (contributor) - 1968
Persistent link: https://www.econbiz.de/10002266985
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Počvy Bolgarii
Gerasimov, Innokentij P. (contributor);  … - 1959
Persistent link: https://www.econbiz.de/10002323137
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1853-1968
Pavlov, Ljuben Iv. - 1970
Persistent link: https://www.econbiz.de/10002620804
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Upravlenie na geologoproučvatelnite raboti v NRB i vŭzmožnosti za prilaganeto na njakoi elementi na stopanskata smetka
Kostov, Simeon - In: Ikonomičeska misăl 24 (1980) 1, pp. 38-48
Persistent link: https://www.econbiz.de/10002248005
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Geologija na Bŭlgarija
Bončev, Ekim St. - 1960
Persistent link: https://www.econbiz.de/10002328186
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Ljulinskijat konglomerat po čuždi i svoi nabljudenija : das Lülinkonglomerat nach anderer u. eigener Beobachtungen
Radev, V. G. - 1928
Persistent link: https://www.econbiz.de/10002697899
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Izučvanie vŭrchu geologičeskija stroež na zapadnata vrŭzka meždu Balkana i Srědna-Gora
Puškarov, N. - 1927
Persistent link: https://www.econbiz.de/10002672253
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Geologische Karte der östlichen und zentralen Balkanhalbinsel
Bončev, Stefan (cartographer) - Geografski Institut <Sofia> - 1936
Persistent link: https://www.econbiz.de/10001647247
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Počvite v Bǔlgarija
Gerasimov, Innokentij P.; Antipov-Karataev, I. N.; … - 1960
Persistent link: https://www.econbiz.de/10014413682