First Day Cover
首日封
Sobrescrito de 1.º Dia
China
Scientists of Modern China (VIII)
Date of Issue : 19 September 2020
4-1 : Wang Daheng
4-2 : Huang Kun
4-3 : Yu Min
4-4 : Chen Jingrun
首日封
Sobrescrito de 1.º Dia
ChinaScientists of Modern China (VIII)
Date of Issue : 19 September 2020
4-1 : Wang Daheng
4-2 : Huang Kun
4-3 : Yu Min
4-4 : Chen Jingrun
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