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Georgius Agricola’s 1546 book De Ortu et Causis Subterraneorum (On the Source and Causes of What is Underground) was the first European work since antiquity to focus on hydrology and helped to shape the thought of Nicolaus Steno, Pierre Perrault, A.G. Werner, and other important figures in the history of hydrology and geology. De Ortu contains the first known expressions of numerous concepts important...