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1Published 1987Subjects: “...Bulgarian language History Congresses....”
Conference Proceeding Book -
2Published 1969Subjects: “...Bŭlgarska akademii︠a︡ na naukite History....”
Book -
3Published 1983Subjects: “...Bulgarian literature History and criticism Congresses....”
Conference Proceeding Book -
4Published 1982“...Bulgaria Research History Congresses....”
Conference Proceeding Book