Osterhout, Paul. [Letter from Paul Osterhout to Gertrude Osterhout, January 11, 1881], letter, January 11, 1881; (https://texashistory.unt.edu/ark:/67531/metapth255465/m1/1/: accessed April 27, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .