[Letter from Ken L. Laird to All Brokers - List #1, March 21, 1955], letter, March 21, 1955; (https://texashistory.unt.edu/ark:/67531/metapth1162016/m1/2/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .