Incunable leaf turned into book cover. Vincent of Beauvais, Speculum doctrinale. Strasburg, "Printer with the weird R" (Adolf Rusch), 1477 or 1478. GW M50558 or M50560, f. 32/33v
(@stabiberlin.bsky.social, Hymn. 8283)
resolver.staatsbibliothek-berlin.de/SBB0000C2C80...
