Eckhart, Theodore W. [Letter from Theodore Eckhart to Carl Studtmann, September 1, 1932], letter, September 1, 1932; (https://texashistory.unt.edu/ark:/67531/metapth494597/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .