the river dropped to reveal rocks as white and shiny as cleaned bone—rounded boulders and fingered slabs picked up ten thousand years earlier by glacier and deposited dumbly along the gravel and dirt riverbed. A few miles downstream, the receding water brought three old men with metal detectors to a calm stretch of midriver, where there were rumors of a sunken ferry boat and lost mining treasure. The old men combed the newly exposed banks, each listening to his own progress through headphones, each playing in his mind some version of the story of old coins and silver nuggets, each willing to
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