1. 1
   Godishnik na Glavnoto upravlenie po geologii︠a︡. Ezhegodnik Glavnogo upravlenii︠a︡ geologii. Serii︠a︡ A = Annuaire de la Direction générale de géologie. Série A.

   Published 1962

   Sofii︠a︡ : Dŭrzhavno izd-vo "Tekhnika", 1962-

   v. : ill. ; 24 cm.

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2. 2
   Minno delo

   Published 1959

   Sofi︠i︡a : Minno delo, -1959.

   v. : ill. ; 24 cm.

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