Four pieces that were used as transverse spine lining between the sewing supports in Cod. 3759. The middle section of each pair (Fragm. 308-1 and 308-2, and Fragm. 308-3 and 308-4) is probably still in the spine of the host volume.
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Wien, Österreichische Nationalbibliothek, Fragm. 308, Cod3759_HD – Writing exercises — https://fragmentarium.ms/view/page/F-2pfn/1903/23029