Kempner, Isaac Herbert, III. [Letter from I. H. Kempner, III to William C. Griffith, August 30, 1973], letter, August 30, 1973; (https://texashistory.unt.edu/ark:/67531/metapth1210246/m1/2/: accessed July 12, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .