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This book includes difficult-to-find information about significant Oklahoma outlaws who lived and worked during the 100-year period 'from horseback to Cadillac.' While criminal history within Oklahoma is the focus, famous crimes committed elsewhere by Oklahomans, such as the Barker Gang, Wilbur Underhill, and Machine Gun Kelly, as well as Oklahoma connections to legendary outlaws like Wyatt Earp, Billy the Kid, John Dillinger, and Baby Face Nelson are also mentioned.