Democritus of Abdera
Greece
1961. Inauguration of "Democritus" Nuclear Research Centre
| SG875 | 2d50 | Reactor building |
| SG876 | 4d50 | Democritus and atomic symbol |
1983. 1st International Democritus congress, Xanthe
| SG1632 | 50d | Democritus |
First day cover
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@ Hung