Helmbrecht, W. C., Jr. [Letter from W. C. Helmbrecht, Hr. to Harris Leon Kempner, February 26, 1959], letter, February 26, 1959; (https://texashistory.unt.edu/ark:/67531/metapth1424957/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .