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1Geologi︠i︡a na chastʹ ot ︠t︡sentralni︠i︡a Balkan i Predbalkana v oblastʹta na gornoto techenie na r︠i︡eka VidimaГеология на част от централния Балкан и Предбалкана в областта на горното течение на рѣка Видима = Géologie d'une partie du Balkan et le Prébalkan central dans le bassin de la rivière Vidima (Bulgarie) /by Landzhev, Ivan N.
Published 1940Sofi︠i︡a : Pechatni︠t︡sa "Khudozhnik", 1940.68 p., [3] leaves of plates (some folded) : ill. ; 23 cm. -
2by Kamenov, Bo︠i︡an G.
Published 1936Sofi︠i︡a : [s.n.], 1936.140 p., vii leaves of plates (some folded) : ill., map ; 24 cm.