Oklahoma State Labor News (Oklahoma City, Okla.), Vol. 1, No. 9, Ed. 1 Friday, June 29, 1906, newspaper, June 29, 1906; (https://gateway.okhistory.org/ark:/67531/metadc154723/m1/1/: accessed April 19, 2024), University of North Texas Libraries, The Gateway to Oklahoma History, gateway.okhistory.org; .