Title: Desetii︠a︡t kongres na BKP i zadachite pred nauchnite rabotnit︠s︡i
Subjects: Sŭi︠u︡z na nauchnite rabotnit︠s︡i v Bŭlgarii︠a︡. Kongres 1971 : Sofia, Bulgaria), Bŭlgarska komunisticheska partii︠a︡. Kongres 1971 : Sofia, Bulgaria)