Godisenʺzemledělsko-meteorologičenʺ bjuletiiʺ = Bulletin annuel de l'Institut météorologique central de Bulgarie à Sofia.
Institut météorologique central de Bulgarie à Sofia.
{s.n. : The Institute],
1931-
Formed by the union of :  Bulletin annuel de l' Institut météorologique central de Bulgarie, and of the annual supplement to the Bulgarian version of the bulletin (title unknown).
Mesečenʺzemledělsko-meteorologičenʺ bjuletiiʺ
Bulletin annuel de l' Institut météorologique central de Bulgarie