ECOLOGICAL CROSS SECTION OF THE MISSISSIPPI. 



239 



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so U R I 





1 ILLINOIS 





Bluff 



Lowland 



River 





Lowland 





Bluff 

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Upland 



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16 



17 



5 



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18 



19 



11 



12 



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20 



21 



22 



23 



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26 



25 



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18 



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