[Letter from I. H. Kempner, Jr., to Directors of Imperial Sugar Company, June 4, 1953], letter, June 4, 1953; (https://texashistory.unt.edu/ark:/67531/metapth1031394/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .