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Innovationen im Quadrivium des 10. und 11. Jahrhunderts : Studien zur Einführung von Astrolab und Abakus im lateinischen Mittelalter / Werner Bergmann.

Number words and number symbols : a cultural history of numbers / Karl Menninger ; translated by Paul Broneer from the revised German ed.

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Abacus

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Innovationen im Quadrivium des 10. und 11. Jahrhunderts : Studien zur Einführung von Astrolab und Abakus im lateinischen Mittelalter / Werner Bergmann.

Number words and number symbols : a cultural history of numbers / Karl Menninger ; translated by Paul Broneer from the revised German ed.