[Letter from Dan Oppenheimer to I. H. Kempner, December 14, 1946], letter, December 14, 1946; (https://texashistory.unt.edu/ark:/67531/metapth1467362/m1/1/: accessed June 24, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .