R.G. LeTourneau, Inc. NOW, Volume 5, Number 15, August 30, 1940, periodical, August 30, 1940; (https://texashistory.unt.edu/ark:/67531/metapth1532574/m1/4/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .

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