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The Abacus: A Brief Introduction
China's abacus applies to be a World Intangible Cultural Heritage - People's Daily Online
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An Introduction to the Traditional Abacus of China and Japan | Physics Forums
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The Story of the Chinese Abacus
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File:Chinese-abacus.jpg - Wikipedia
The Origin and Evolution of Abacus
Abacus Explained — Everything You Need To Know - History-Computer
The Chinese Abacus, History, How to Use the Chinese Abacus
Chinese Abacus: 600 Years and Counting
Ancient China Abacus. Its history, structure and usage.
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The Story of the Chinese Abacus
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