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https://kb.osu.edu/handle/1811/56970
https://www.academia.edu/9539090/The_Presence_Source_and_Use_of_Fossil_Shark_Teeth_from_Ohio_Archaeological_Sites
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https://www.academia.edu/11497086/Shark_Teeth_from_Ohio_Archaeological_Sites_An_Update_Based_on_Newly_Discovere