From the Wikipedia page [1] The Bulgarian Historical Archive (Bulgarian: Български исторически архив) functions as part of the SS. Cyril and Methodius National Library and keeps more than 1.5 million documents and a separate collection "Portraits and Photos" consisting of 80,000 photos all of historical importance for Bulgaria and the Balkans. It was established in 1878 The website, in Bulgarian, is [2]
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