Estate Find from Arkansas

[SellSeaShell]

Here are some shells that I acquired from an estate in Arkansas.  I wouldn't mind knowing more about them for the purpose of selling them or trading them (I will be selling rocks and minerals in a couple of weeks and may run into people selling shells) at a reasonable value.  So I probably should figure out some of the names them.  There are a lot in the pictures so I don't mind if I don't know everything about each one. 

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