Cason, Nancy. [Letter from Nancy Cason to Polly Tallas, February 27, 1991], letter, February 27, 1991; (https://texashistory.unt.edu/ark:/67531/metadc1040075/m1/1/: accessed June 24, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .