Charles, D., 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 WorldUniversity College London Press, London. pp. 43-70.

Van Nest, J., 2006. Rediscovering This Earth: Some Ethnogeological Aspects of the Illinois Valley Hopewell Mounds, in: Charles, D., Buikstra, J. (Eds.), Recreating HopewellUniversity Press of Florida, Gainesville, Florida. pp. 402-426.

Van Nest, J., Charles, D., Buikstra, J., Asch, D., 2001. Sod Blocks in Illinois Hopewell Mounds. American Antiquity 66, 633-650. doi:10.2307/2694177