Ė. B. ValevBooksĖkonomicheskai︠a︡ geografii︠a︡ zarubezhnykh sot︠s︡ialisticheskikh stran (Evropa, Kuba)Ėkonomicheskai︠a︡ geografii︠a︡ zarubezhnykh sot︠s︡ialisticheskikh stran AziiBolgarii︠a︡RumyniiaAlbani︠a︡KubaBolgariiaAuthor data: Open Library