Beatrice Daily Sun (Neb.), “Gets Life,” June 13, 1934.
Beatrice Daily Sun (Neb.), “Suspect Picked Up in Omaha Slaying,” April 27, 1953.
Beatrice Daily Sun (Neb.), “Suspect in Omaha Slaying Released,” April 29, 1953.
Great Falls Tribune (Mont.), “Professional Safe Cracker Claims ‘Frame’ in Briggs Implement Theft,” Feb. 15, 1971.
Great Falls Tribune (Mont.), “Professional ‘Safeman’ Gets 15-Year Sentence,” Feb. 17, 1961.
La Crosse Tribune and Leader-Press (Wisc.), “Holdup at Bank of Spring Valley Brings Life Term,” June 13, 1934.
Nevada State Journal, “Bank Robber Suspect Caught in Las Vegas,” Dec. 31, 1933.
Reno Evening Gazette (Nev.), “Vegas Resident Held as Thief,” Jan. 11, 1934.
The Lime Springs Herald (Iowa), “Set $25,000 Bail For Spring Valley Bank Suspect,” Feb. 1, 1934.
The Salt Lake Tribune (Utah), “Bank Robber Suspect Loses Plea in Court,” Jan. 1, 1934.
The St. Cloud Daily Times (Minn.), “Spring Valley Bank is Robbed,” Oct. 3, 1933.
The Winona Republican-Herald (Minn.), “Spring Valley Bank Robbed of $2,000,” Oct. 3, 1933.
The Winona Republican-Herald (Minn.), “Bank Bandits Get $386,000 in State Holdups in Year,” Jan. 15, 1934.
The Winona Republican-Herald (Minn.), “‘Cappy’ Simpson Convicted, Gets Life in Prison,” June 13, 1934.
United States Social Security Death Index.