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Mississippian Birdmen (a, b, c, f Eagle Being from Etowah and Spiro, a and c are holding human heads; d, e, h, i other representations from Spiro: g is a chunkey player).
Waring, A.J., Jr., and P. Holder 1968. A Prehistoric Ceremonial Complex in the Southeastern United States. In The Waring Papers, The Collected Works of Antonio J. Waring, Jr., edited by Stephen Williams, p. 9-29. Peabody Museum of Archaeology and Ethnography, Cambridge MA. Fig. 6, p.19