Osterhout, John Patterson. [Letter from John Patterson Osterhout to Paul Osterhout, June 7, 1886], letter, June 7, 1886; (https://texashistory.unt.edu/ark:/67531/metapth255514/m1/3/: accessed February 20, 2020), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .