A. R. Leonard and D. W. Berry, “Geology and Ground-Water Resources of Southern Ellis County and Parts of Trego and Rush Counties, Kansas”, kgsbulletin, no. 149, pp. 1–156, Jan. 1960, Accessed: Nov. 03, 2024. [Online]. Available: https://journals.ku.edu/kgsbulletin/article/view/22164