[Letter from Truett Latimer to V. C. Perini, Jr., April 15, 1957], letter, April 15, 1957; (https://texashistory.unt.edu/ark:/67531/metapth1263481/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .