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Jun 27, 2024 · [Nikolaev] Nikolaev, Vsevolod. Watermarks of the mediaeval Ottoman documents in Bulgarian libraries (Watermarks of the Ottoman Empire, volume 1) Sofia: Bulgarian Academy of Sciences, 1954. For a more accessible overview and introduction to relevant references, see Beate Wiesmüller's account of the watermarks in the Refaiya-Library and the Watermark Wednesdays blog series (Evyn Kropf)
