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  394k v. 1 Mar 25, 2014, 11:05 AM William Schmachtenberg
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App to help students identify fossils at the K12, college, and university/research level.  May 21, 2018, 7:35 AM William Schmachtenberg
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science paper  481k v. 1 Aug 15, 2011, 10:49 AM William Schmachtenberg
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  529k v. 1 Jun 20, 2013, 4:29 PM William Schmachtenberg
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