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Amazon.com: Polished Stones of Petrified Wood : a Fossil Specimen Tree Branch Turned to Agate Filled Stone from Madagascar, Weighs at Least 1 Lb, Stands Between 2-4" High as a Display Item,
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Protecting Arizona's Petrified Forest Can Be as Easy as Taking a Hike | Science | Smithsonian Magazine
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Monday Geology Picture(s): Rocks Flanking the Entrance to the Smithsonian Natural History Museum - Georneys - AGU Blogosphere
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