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If you'd like to read more about this, I recommend John Wesley Powell's biography: "Beyond the Hundredth Meridian: John Wesley Powell and the Second Opening of the West" https://amzn.to/2H2v7oZ

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Another good one (though a bit dated now) is Great Plains by Ian Frazier.

https://www.amazon.com/Great-Plains-Ian-Frazier/dp/031227850...

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