Stamps of China, PRC, scientists of modern China design type
1 to 4 of 4
postage
2011, May 25 scientists of modern China unwmk p. 13
| - | 1.20y | multi | Bei Shizhang | |||
| - | 1.20y | multi | Qian Xuesen | |||
| - | 1.20y | multi | Hou Xianglin | |||
| - | 1.20y | multi | Qian Sanqiang |
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