Beyer, C. M. [Letter from C. M. Beyer to R. Osthoff, September 29, 1932], letter, September 29, 1932; (https://texashistory.unt.edu/ark:/67531/metapth606493/m1/2/: accessed August 13, 2020), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .