In this Wednesday Feb. 13, 2013 photo, Curt Viebranz, the president of George Washington’s historic Mount Vernon estate, stands outside what will be a climate controlled book vault inside the under-construction George Washington Library, at Mount Vernon, Va. (AP Photo/Jacquelyn Martin)

Associated Press
In this Wednesday Feb. 13, 2013 photo, Curt Viebranz, the president of George Washington’s historic Mount Vernon estate, stands outside what will be a climate controlled book vault inside the under-construction George Washington Library, at Mount Vernon, Va. (AP Photo/Jacquelyn Martin)
In this Wednesday Feb. 13, 2013 photo, Curt Viebranz, the president of George Washington’s historic Mount Vernon estate, stands outside what will be a climate controlled book vault inside the under-construction George Washington Library, at Mount Vernon, Va. (AP Photo/Jacquelyn Martin)
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