China's Ancient ScientistsTo commemorate scientists in ancient China, the Chinese Ministry of Post and Telecommunications issued a set of four stamps on November 20, 1980.Stamp 1, Xu Guangqi...
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China's Ancient ScientistsTo commemorate scientists in ancient China, the Chinese Ministry of Post and Telecommunications issued a set of four stamps on November 20, 1980.Stamp 1, Xu Guangqi...