United States Department of Justice. Office of Justice Programs. Bureau of Justice Statistics. National Prisoner Statistics, 1978-2011. ICPSR34540-v1. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2013-06-25. doi:10.3886/ICPSR34540.v1 “The National Prisoner Statistics (NPS) data collection began in 1926 in response to a congressional mandate to gather information on persons incarcerated in state… Continue Reading