Dr. Erik Kwakkel and Dr. Beth Harris look at a medieval textbook: Boethius, De institutione arithmetica, c. 1100 (National Library of the Netherlands, The Hague, MS 78 E 59). With special thanks to Ed van der Vlist, Curator of Medieval Manuscripts, Koninklijke Bibliotheek, National Library of the Netherlands. Created by Beth Harris and Steven Zucker.
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