Greene, Frank J. [Letter from Frank J. Greene to Harris L. Kempner, September 23, 1957], letter, September 23, 1957; (https://texashistory.unt.edu/ark:/67531/metapth1419505/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .