Khidrobiologii︠a︡.
Bŭlgarska akademii︠a︡ na naukite.
[Sofii︠a︡ : Izd-vo na Bŭlgarskata akademii︠a︡ na naukite],
1975-
Bibliography of agriculture
Chemical abstracts
Selected water resources abstracts
Issued by Bŭlgarska akademii︠a︡ na naukite.
Aquatic biology.