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Imagine being a geological mapper in the 1870s. The profession is now aided by satellite and airborne data, and an ability to drive close to most areas of geological interest.

United statesCharles wilson pealeAllen david wilsonKen pierceHenry gannettRobert christiansenClarence duttonWilliam henry holmesAlbert charles pealeMount evertsThomas jeffersonFerdinand vandeveer haydenYellowstone national parkUs geologicalGeographical survey of the territoriesYellowstone caldera chronicles