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About North Georgia: The Pre Historic Moundbuilders
Nice site gives details about the mound builders that florished until the arrival of the Europeans.
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North Georgia History: Georgia's Moundbuilders
Overview of Archaic, Adena, Hopewell, and Mississippian cultures. Site offers links and pictures of Etowah Indian Mounds, Kolomoki Mounds, and Earth Lodge at Ocmulgee.