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Greek postage stamp commemorating Democritus
- circa 1961
Stamp from the inauguration of Democritus Nuclear Research Centre in Agia Paraskevi. Depicts ancient Greek philosopher Democritus and a model of an atom.
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Soviet postage stamp commemorating the 20th anniversary of the Institute for Nuclear Research of the Russian Academy of Sciences
- 1976
Stamp published by the Soviet Union depicts images of an atom and the Institute for Nuclear Research of the Russian Academy of Sciences.