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The Bibliography of Slavic Publications from the German Democratic Republic 1946-1986 (BibSlawPub) was converted from the the five volumes printed publication to a database and contains about 19.600 records. The overview for the volumes can be found here. The Classification overview is here.
Your search for Bŭlgarskata ėtnografija (1975) provides 1 hits | |
1 | Iz istorijata na lužickite sorbi v Germanskata demokratična republikaEine, A. - in: Bŭlgarskata ėtnografija (1975) 1, S. 55-63 |