Petroleum Refinery Statistics, 1926, report, 1927; (https://digital.library.unt.edu/ark:/67531/metadc12467/m1/1/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .
Petroleum Refinery Statistics, 1926, report, 1927; (https://digital.library.unt.edu/ark:/67531/metadc12467/m1/1/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .