ARMENIA - CIRCA 2017: canceled stamp printed in Armenia shows Russian-Armenian scientist, nuclear physicist Yuri Oganessian, founder of the superheavy chemical element oganesson in Periodic Law(classification of elements) by Dmitri Mendeleev, circa 2017.

ARMENIA - CIRCA 2017: canceled stamp printed in Armenia shows Russian-Armenian scientist, nuclear physicist Yuri Oganessian, founder of the superheavy chemical element oganesson in Periodic Law(classification of elements) by Dmitri Mendeleev, circa 2017.  - 106469924

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