1 - First classifications of the elements
1 - First classifications of the elements
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W. Döbereiner
W. Döbereiner
A. Chancourtois- The telluric helix
A. Chancourtois- The telluric helix
J. Newlands
J. Newlands
L. Meyer
L. Meyer
D.I. Mendeleiev
D.I. Mendeleiev
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