[Letter from John M. Hogan to F. K. Adoue, December 11, 1956], letter, December 11, 1956; (https://texashistory.unt.edu/ark:/67531/metapth1320178/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .