Hull, William C. [Letter from William C. Hull to W.R. Ely - April 17. 1943], letter, April 17, 1943; (https://texashistory.unt.edu/ark:/67531/metapth654917/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .