[Letter from Isaac H. Kempner to Briscoe Irrigation Company, July 16, 1964], letter, July 16, 1964; (https://texashistory.unt.edu/ark:/67531/metapth1513499/m1/1/: accessed June 24, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .