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Diderot & d’Alembert (1768) ‘Mineralogy, 7th collection. Veins and Works in Mines, plate 2 (p.157) from Encylopedie, v23. Copperplate engraving

Diderot & d’Alembert (1768) ‘Mineralogy, 4th collection. Mountains, plate 2 (p.136) from Encylopedie, v23. Copperplate engraving