Calgary Public Library
513.5
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513.5
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513.5
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Finding zero, a mathematician's odyssey to uncover the origins of numbers, Amir D. Aczel
Candy, 1 to 20, by Laurie Wolf and Pam Abrams ; photographs by Bruce Wolf
The history of counting, Denise Schmandt-Besserat ; illustrated by Michael Hays
The number system and common and decimal fractions, edited by Michael J. Cominskey
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