John Muir and the Ice That Started a Fire: How a Visionary and the Glaciers of Alaska Changed America.
Why do I think that it is really, really good book? 4.6 stars at Amazon, the "#1 best seller (pssst! Hey Amazon: "#1" and "best" are redundant) at Amazon in "Adventurer & Explorer Biographies."
Why do I say that it is a really, real great deal? It's got a print list price of $18.95, but the Kindle price right now is
99 cents.
And this is no pamphlet or booklet, with its 266 pages.
https://www.amazon.com/John-Muir-That-Started-Fire-ebook/dp/B00MJD9NOK