San Mateo Times (Calif.), “Tom Keen Killed by Bomb,” Feb. 5, 1952.
San Mateo Times (Calif.), “Crackdown on Reluctant Keen Witnesses,” May 2, 1952.
San Mateo Times (Calif.), “New Lead Develops in Keen Murder at End of One Year’s Probe,” Feb. 3, 1593.
San Mateo Times (Calif.), “Report Revives Keen Findings,” April 29, 1953.
San Mateo Times (Calif.), “Report on Keen Case Rapped [sic],” May 11, 1953.
San Mateo Times (Calif.), “Tom Keen, Bomb Victim, Left $203,799 Estate,” June 10, 1953.
The Daily Journal, “Tom Keen’s Murder Was Never Solved,” Joan Levy, April 30, 2007, smdailyjournal.com.
The Humboldt Times (Eureka, Calif.), “San Mateo Police Investigate Race Promoter’s Bomb Death,” Feb. 6, 1952.