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(1989). Principles of Topology. Saunders College Publishing. ISBN 978-0-03-029804-2. Richeson, D. (2008). Euler's Gem: The Polyhedron Formula and the...35 KB (4,041 words) - 15:56, 13 July 2024
Principles of Topology. Saunders College Publishings. pp. 1122–27. ISBN 978-0-03-029804-2. "Metrication in other countries". USMA. US Metric Association. Retrieved...130 KB (14,019 words) - 11:29, 8 July 2024