Images: Preserving a national treasure: Tomb of the Unknowns [Image 28 of 61]
Photo by Kerry Solan![]()
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Carefully measured ingredients sit ready to be used in a mixture that will be used to repair cracks in the Tomb of the Unknowns at Arlington National Cemetery. A mixture of lime, cement and crushed marble is used to bond to and fill the cracks in the stone.
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