1. The Late Middle/Early Late Archaic in the Falls Region
2. The Devonian Period
3. Bennett, E. and Gatz, C. 2008. Louisville, Kentucky: A Restoring Prosperity Case Study. Metropolitan Policy Program, Brookings Institution, https://www.brookings.edu/articles/a-restoring-prosperity-case-study-louisville-kentucky/#:~:text=In%20response%2C%20Louisville%20began%20a,century%20competitiveness%2C%20most%20notably%20by
4. Boarman, D. 2001. Audubon, John James. In: Kleber, J.E. (ed.) The Encyclopedia of Louisville. University of Kentucky Press, 53.
5. Report of a geological survey of Clark and Floyd counties, Indiana;Borden W.W.;Indiana Geological Survey Annual Report,1874