There is a great book called The Emerald Mile that touches on some of this history, and other Grand Canyon history, using the story of the fastest traversal as

There is a great book called The Emerald Mile that touches on some of this history, and other Grand Canyon history, using the story of the fastest traversal as the narrative device. Highly recommend. https://www.goodreads.com/book/show/15803144-the-emerald-mile https://www.goodreads.com/book/show/15803144-the-emerald-mil...