[Letter from D. W. Kempner to I. H. Kempner Jr., April 12, 1951], letter, April 12, 1951; (https://texashistory.unt.edu/ark:/67531/metapth1013226/m1/2/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .