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By Bruce Byers | Published June 30, 2015 | Full size is 520 × 673 pixels

John Burroughs and John Muir at the Grand Canyon. 1909. Historic photo by Fred Harvey.

John Burroughs and John Muir at the Grand Canyon. 1909. Historic photo by Fred Harvey.

John Burroughs and John Muir at the Grand Canyon. 1909. Historic photo by Fred Harvey.

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