McCarthy, James E. & Zinn, Jeffrey A. Agriculture and EPA’s New Air Quality Standards for Ozone and Particulates, report, March 24, 1998; (https://digital.library.unt.edu/ark:/67531/metadc817253/m1/1/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .