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I J0KN30NVILLC 



MAP OF THE 



TENNESSEE RIVER 



Showing Distribution of Snails 



of the Genus 10 



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Charles C. Adams. 



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(Adapted from on old Government Map.) 



Scale o/^iles. 



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TheUr^e Numbers, I (o27, Indicate the Approximate Location of the 



Different Groups of Sheiti Which Furnish the Basis for the 



Pistes and the Quantitative Studies of the Genus. 



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