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Conqueror of the Grand Canyon
出版Ariel Books, 1958
URLhttp://books.google.com.hk/books?id=SLE_AAAAIAAJ&hl=&source=gbs_api
註釋In 1869, John Wesley Powell, a one-armed Civil War veteran led a party of men in rowboats down a thousand miles of unexplored canyons and swift water. Although none of them had ever shot the rapids before, when they reappeared over three months later, all were seasoned white-water paddlers.