Blank, Horace R., Walter G. Knisel and Ralph W. Baird. Geology and Groundwater Studies in Part of the Edwards Plateau of Texas, Including Sutton and Adjacent Counties, : United States Department of Agriculture, Agricultural Research Service, April 1966, Box: 15, Item: FL-198. Hans A. Einstein Flow collection, MS-89/4. Water Resources Collections & Archives. https://public.ucrlib.aspace.cdlib.org/repositories/5/archival_objects/582615 Accessed April 21, 2025.