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The organized layout of Cahokia - line map of celestial orientations from Monks Mound and Mound 72.
Rolingson, M.A. 1996. Elements of Community Design at Cahokia. In The Ancient Skies and Sky Watchers of Cahokia: woodhenges, Eclipses, and Cahokian Cosmology. Wisconsin Archaeologist. 77(3/4):84-96. Fig. 7.4, p.89
Image courtesy of The Wisconsin Archaeologist.