[Letter from I. H. Kempner to H. M. Baldrige, December 1, 1960], letter, December 1, 1960; (https://texashistory.unt.edu/ark:/67531/metapth1182184/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .