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Preserving a national treasure: Tomb of the Unknowns

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Uploaded by on Sep 15, 2011

Since 1931, the monument at the Tomb of the Unknowns has served as the centerpiece of America's most hallowed ground. In this historic cemetery, which bears witness to the military service and sacrifice of men and women in uniform throughout the nation's history, engineers, scientists and conservationists are working to protect and preserve a national treasure ...

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