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https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/573277
Abacus from Map Modeling in Geography, Including the Use of Sand, Clay, Putty, Paper Pulp, Plaster of Paris... Also Chalk Modeling in its Adaptation to Purposes of Illustration. Fully Illustrated published by E.L Kellogg & Co. (1895). Original from the British Library. Digitally enhanced by rawpixel.
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Abacus from Map Modeling in Geography, Including the Use of Sand, Clay, Putty, Paper Pulp, Plaster of Paris... Also Chalk Modeling in its Adaptation to Purposes of Illustration. Fully Illustrated published by E.L Kellogg & Co. (1895). Original from the British Library. Digitally enhanced by rawpixel.

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Abacus from Map Modeling in Geography, Including the Use of Sand, Clay, Putty, Paper Pulp, Plaster of Paris... Also Chalk Modeling in its Adaptation to Purposes of Illustration. Fully Illustrated published by E.L Kellogg & Co. (1895). Original from the British Library. Digitally enhanced by rawpixel.

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