E. R. Elledge and P. Teetor, “The Economic Geology of the Arkansas City District / Clay and Shale Resources in the Vicinity of Arkansas City, Kansas”, kgsbulletin, no. 8, pp. 1–47, Jan. 1921, Accessed: Jul. 22, 2024. [Online]. Available: https://journals.ku.edu/kgsbulletin/article/view/21828