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| navigate by keyword : 1964 biologist botanist communications discover dmitri dmitriy dmitry hobby ivanovski ivanovsky mail man philately post postal russian science scientist soviet stamp ussr vintage virology |
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| MADRID, SPAIN - DECEMBER 22, 2024. Vintage stamp printed in USSR shows Dmitri Ivanovski (1864 - 1920), a Russian botanist, the co-discoverer of viruses (1892), and one of the founders of virology |
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