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Sǔstojanie i perspektivi na razvitie na vŭglištnoto ni stopanstvo : mit russ. u. franz. Résumé: Etat et perspectives des charbonnages bulgares
Ivanov, Dimitŭr; Radev, Radi - In: Ikonomičeska misăl 4 (1959) 4, pp. 14-33
Persistent link: https://www.econbiz.de/10002181327
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Ikonomičesko rajonirane na NR Bŭlgarija
Zachariev, Ivan (contributor);  … - 1963
Persistent link: https://www.econbiz.de/10014386894