Crutchfield, J. W. [Letter from J. W. Crutchfield to Truett Latimer, June 21, 1961], letter, June 21, 1961; (https://texashistory.unt.edu/ark:/67531/metapth1271210/m1/1/: accessed July 6, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .