Gosnold, William D.; Eversoll, Duane, A.; Messenger, Karen A. & Carlson, Marvin P. An inventory of Geothermal Resources in Nebraska: State-Coupled Program between US Department of Energy and The University of Nebraska. Final report, June 30, 1983, report, June 30, 1983; (https://digital.library.unt.edu/ark:/67531/metadc873786/m1/1/: accessed January 19, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .