Armstrong, R. Wright. [Letter from Wright Armstrong to I. H. Kempner, March 4, 1963], letter, March 4, 1963; (https://texashistory.unt.edu/ark:/67531/metapth1508985/m1/1/: accessed July 13, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .