Tar Sand, report, January 1, 1990; (https://digital.library.unt.edu/ark:/67531/metadc1102262/m1/1/: accessed May 30, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .
Tar Sand, report, January 1, 1990; (https://digital.library.unt.edu/ark:/67531/metadc1102262/m1/1/: accessed May 30, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .