Sawin, R. S., Franseen, E. K., Watney, W. L., West, R. R., & Ludvigson, G. A. (2009). New Stratigraphic Rank for the Carboniferous, Mississippian, and Pennsylvanian in Kansas. Current Research in Earth Sciences, 256, 1-4. https://doi.org/10.17161/cres.v0i256.11846