Board of Control Records, Biennial Reports.
Board of Control Records, Minutes.
Circuit court records related to the escape as well as prior convictions of the four convicts may be found in records held by the Oregon State Archives and/or individual counties (e.g., Marion, Josephine, etc.). Consult the "Oregon Historical County Records Guide" for detailed inventories of circuit court records held by various repositories around the state: http://arcweb.sos.state.or.us/pages/records/local/county/index.html
Oregon Supreme Court Case Files, State of Oregon vs. Ellsworth Kelley and James Willos # 5448.
Salem Statesman Journal (newspaper): August 1925, May 1926, April 1928.