Xiong Qinglai (mathematician) and Formula 20 分 — China, 1992
Xiong Qinglai (mathematician) and Formula (China, 1992), face value 20 分, “Scientists 1992” series. Photo, catalogue value, details and photo identification.
- Series
- Scientists 1992
- Issue date
- 1992
- Face value
- 20 分
- Colors
- Multicolor
- Yvert
- CN 3139
- Michel
- CN 2450
- Stanley Gibbons
- CN 3821
- Scott
- CN 2416