Paller, M & Bill Littrell, B. LONG-TERM CHANGES IN MERCURY CONCENTRATIONS IN FISH FROM THE MIDDLE SAVANNAH RIVER, article, January 2, 2007; (https://digital.library.unt.edu/ark:/67531/metadc881835/m1/1/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .