[Letter from I. H. Kempner to Dr. and Mrs. E. R. Thompson, December 16, 1957], letter, December 16, 1957; (https://texashistory.unt.edu/ark:/67531/metapth1476904/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .