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Discovery of the element Columbium called later Niobium (Hatchett) Traité de minéralogie (Treatise on Mineralogy) by René-Just Haüy --- 1 January 1801 discovery of 1 Ceres -- 16 June 1801 Birth of Julius Plücker 27 July 1801, Birth of George Biddell Airy in Alnwick, Northumberland, England 19 September 1801 Death of Johann Gottfried Köhler in Dresden, Germany
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