Groundwater Protection Program Calendar Year 1998 Evaluation of Groundwater Quality Data for the Upper East Fork Poplar Creek Hydrogeologic Regime at the U.S. Department of Energy Y-12 Plant, Oak Ridge, Tennessee, report, September 1, 1999; (https://digital.library.unt.edu/ark:/67531/metadc623246/m1/1/: accessed April 24, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .