The First Recorded Descent Down the Grand Canyon Was 150 Years Ago, Here's How It's Changed Since

The First Recorded Descent Down the Grand Canyon Was 150 Years Ago, Here's How It's Changed Since
https://www.forbes.com/sites/kristinayoung1/2019/06/30/the-first-recorded-descent-down-the-grand-canyon-was-150-years-ago-heres-how-its-changed-since/

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_- Steve