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Obzor na arkhivnite fondove, kolekt͡sii i edinichni postŭplenii͡a, sŭkhrani͡avani v Bŭlgarski istoricheski arkhiv

出版	Narodna biblioteka "Kiril i Metodii," Bŭlgarski istoricheski arkhiv, 1973
URL	http://books.google.com.hk/books?id=XQcJAQAAIAAJ&hl=&source=gbs_api