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James Hutton, Scottish geologist, 1787 (1877). Hutton (1726-1797) working at a rock face with a geological hammer. In 1794 he published his Theory of the Earth
Georgius Agricola (1494-1555), German physician, mineralogist and metallurgist, 1881. Agricola (christened Georg Bauer) was the author of De re metallica (Basel, 1555)
