My First Summer in the Sierra

John Muir, published by the Sierra Club

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Muir gleaned some of the truth of the Universe just by merely existing in it's wild and beautiful regions (can it be that simple?) - his idea that everything is connected predates Sagan and all scientific observations.

This volume in the John Muir Library Series is the most popular of Muir's works: the naturalist's account of his first visit to the High Sierra and the Yosemite.