Hydrogeochemical and Stream Sediment Reconnaissance Basic Data for Grand Island NTMS Quadrangle, Nebraska; Kansas, report, July 31, 1980; (https://digital.library.unt.edu/ark:/67531/metadc957661/m1/1/: accessed April 16, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .