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BTW, he also wrote another must read, "The Man Who Walked Through Time" about his trek through the length of the Grand Canyon back in 1963. He also walked the length of California in the 50's and wrote a book about that too. I think it was called "The Thousand Mile Summer".
Foilist, he died in 2007.
He was sort of a right-wing, un-PC, environmentalist, if you can imagine such a creature.
I have the first three editions. I bought the 4th and returned it. In my opinion, it was a scam -- very little changed from third. I think you would be just as happy with a used copy of the Third Ed.