Osthoff, R. [Letter from R. Osthoff to Henry W. Horst, January 15, 1932], letter, January 15, 1932; (https://texashistory.unt.edu/ark:/67531/metapth606381/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .