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Watkins and Sons. The Ringwood Leader. (Ringwood, Okla.), Vol. 18, No. 26, Ed. 1 Thursday, April 18, 1918, newspaper, April 18, 1918; (https://gateway.okhistory.org/ark:/67531/metadc1722903/m1/1/: accessed March 7, 2021), University of North Texas Libraries, The Gateway to Oklahoma History, gateway.okhistory.org; .