Li Siguang

J149, Scientists of Modern China (1st Set)《中国现代科学家（第一组）》 Stamp Title: Scientists of Modern China (1st Set) Scott No: 2145, 2146, 2147, 2148 Serial number: J149 Values in set: 4 (4-1), Rocksy Li Siguang, 8 fen, 40*30 mm (4-2), Meteorologist and geographer Zhu Kezhen, 10 fen, 40*30 mm (4-3), Physical scientist Wu Youxun, 20 fen, [...]