Day, J. C. [Letter from J. C. Day to David W. Belin, April 23, 1964], legal document, April 23, 1964; (https://texashistory.unt.edu/ark:/67531/metapth340464/m1/1/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .