The feasibility assessment of a U.S. natural gas production reporting system uniform production reporting model. Final report, July 1993--June 1994, report, June 1, 1994; (https://digital.library.unt.edu/ark:/67531/metadc711482/m1/1/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .