File:Chert ,flint in Central Texas 2014-03-12 01-09.jpg
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![File:Chert ,flint in Central Texas 2014-03-12 01-09.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/9/9f/Chert_%2Cflint_in_Central_Texas_2014-03-12_01-09.jpg/600px-Chert_%2Cflint_in_Central_Texas_2014-03-12_01-09.jpg?20140312060927)
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