Canvis

** Unger, Douglas: ''Leaving the Land''. Nova York: Ballantine Books, 1984

** Unger, Douglas: ''Leaving the Land''. Nova York: Ballantine Books, 1984

* Sobre la industrialització:

* Sobre la industrialització:

** Case, Earl Clark: The Valley of East Tennessee: The Adjustment of Industry to Natural Environment , Tennessee. Division of Geology Bulletin 36 . [[Nashville]], [[Tennessee]], 1925

** Case, Earl Clark: The Valley of East Tennessee: The Adjustment of Industry to Natural Environment , Tennessee. División of Geology Bulletin 36 . [[Nashville]], [[Tennessee]], 1925

** Owens, Harry P.: ''Steamboats and the Cotton Economy: River Trade in the Yazoo-Mississippi Delta''. Jackson: University Press of Mississippi, 1990

** Owens, Harry P.: ''Steamboats and the Cotton Economy: River Trade in the Yazoo-Mississippi Delta''. Jackson: University Press of Mississippi, 1990

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