Oslo Posten. (Guymon, Okla.), Vol. 2, No. 14, Ed. 1 Friday, April 7, 1911, newspaper, April 7, 1911; (https://texashistory.unt.edu/ark:/67531/metapth635680/m1/1/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .