Osterhout, Gertrude. [Letter from Gertrude Osterhout to Osterhout Family, March 13, 1881], letter, March 13, 1881; (https://texashistory.unt.edu/ark:/67531/metapth255577/m1/1/: accessed May 4, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .