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        John Muir At Petrified Forest National Park | Ken Burns: The National Parks

        After his time among the petrified trees, some more than 200 million years old, Muir worried that plans to pulverize them into industrial abrasives and to cart others off for table tops would destroy a valuable scientific record. He persuaded President Theodore Roosevelt to declare a national monument, which later became a national park. Source: The Bancroft Library, University of California, Berkeley.

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