[Letter from Daniel W. Kempner to Heinrich A. Fahrenkrog, September 6, 1949], letter, September 6, 1949; (https://texashistory.unt.edu/ark:/67531/metapth1341336/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .