Harrison, Dr. J. W. [Letter from Dr. J. W. Harrison to Dr. Joseph Pound, May 18, 1908], letter, May 18, 1908; (https://texashistory.unt.edu/ark:/67531/metapth743093/m1/1/: accessed June 2, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .