PTL:Marble

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Marble. CaCO3. Available at http://en.wikipedia.org/wiki/Image:MarbleUSGOV.jpg Marble.jpg produced by the U.S. Geological Survey.
Marble. CaCO3. Available at http://en.wikipedia.org/wiki/Image:MarbleUSGOV.jpg Marble.jpg produced by the U.S. Geological Survey.
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