The mixture used to fill the cracks in the stone at the Tomb of the Unknown must be the right mixture of lime, cement and crushed marble in order to bond to the stone. Here, ingredients in the mix are shown.
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This work, Preserving a national treasure: Tomb of the Unknowns [Image 1 of 61], by Kerry Solan, identified by DVIDS, is free of known copyright restrictions under U.S. copyright law.