Charles, D.K., Van Nest, J., Buikstra, J.E., 2004. From the Earth: Minerals and Meaning in the Hopewellian World, in: Boivin, N., Owoc, M.A. (Eds.), Soils, Stones And Symbols: Archaeological And Anthropological Perspectives On The Mineral World. University College London Press, London, pp. 43-70.