Osterhout, Paul. [Letter from Paul Osterhout to George W. Tyler, July 3, 1911], letter, July 3, 1911; (https://texashistory.unt.edu/ark:/67531/metapth243989/m1/1/: accessed April 28, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .