[Letter from F. William Scharpwinkel to I. H. Kempner, September 13, 1948], letter, September 13, 1948; (https://texashistory.unt.edu/ark:/67531/metapth1447351/m1/1/: accessed July 9, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .