United States. General Accounting Office. Government Performance and Results Act: Information on Science Issues in EPA's Performance Report for Fiscal Year 1999 and Performance Plans for Fiscal Years 2000 and 2001, text, August 31, 2000; (https://digital.library.unt.edu/ark:/67531/metadc300100/m1/1/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .