Gentlemen geologists laboriously search for minerals in a river. Handcoloured copperplate engraving from Gottlieb Tobias Wilhelm's Unterhaltungen aus der Naturgeschichte: Des Mineralreichs, Augsburg, 1828.

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Size: 4404px × 7416px
Photo credit: © Florilegius / Alamy / Afripics
License: Licensed
Model Released: No

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