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John Muir
Often called "The Father of our National Parks System," Muir was directly involved in the development of Yosemite, Rainier, the Petrified Forest and the Grand Canyon National Parks. Author of more than 300 articles and 10 books, Muir co-founded the Sierra Club in 1892.
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Muir was previously honored with a 5 cent postage stamp in 1964.