[Letter from R. Osthoff to F. R. Leschber, February 14, 1930], letter, February 14, 1930; (https://texashistory.unt.edu/ark:/67531/metapth606620/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .