Shaka mate \D. H. Rouvray – Endeavour, Elements in the history of the Periodic Table 2004 – Elsevier "As if on cue, only 18 months after the Karlsruhe Congress, the earliest version of the Periodic Table Émile Beguyer de Chancourtois (1819–1886) in April 1862 ."
Shaka mate \D. H. Rouvray – Endeavour, Elements in the history of the Periodic Table 2004 – Elsevier "As if on cue, only 18 months after the Karlsruhe Congress, the earliest version of the Periodic Table was put forward by the French mineralogist Alexandre Émile Beguyer de Chancourtois (1819–1886) in April 1862 ."