Ancient Monuments of the Mississippi Valley
Survey of Jeffers by Charles Whittlesey From Ancient Monuments of the Mississippi Valley (See Squier & Davis Book Below)
GIS by Sean Chaney 2019. Geospatial outlining of Jeffers Earthworks Using ARCGIS over LIDAR. Approximate location of square and circles using dimensions given in the survey.
Jeffers GIS (Approx location of Square and circles)
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