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Virginia officials plan to use ground-penetrating radar to test the long-term stability of Natural Bridge, the landmark limestone arch that supports part of U.S. Route 11. Authorities are concerned about its continuing ability to support some 2,000 vehicles per day. (Associated Press)
Photo by: Jeanna Duerscherl
Virginia officials plan to use ground-penetrating radar to test the long-term stability of Natural Bridge, the landmark limestone arch that supports part of U.S. Route 11. Authorities are concerned about its continuing ability to support some 2,000 vehicles per day. (Associated Press)

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