[Letter from R. Osthoff to Reverend C. M. Beyer, October 17, 1929], letter, October 17, 1929; (https://texashistory.unt.edu/ark:/67531/metapth606619/m1/4/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .