The National Archive of Criminal Justice Data (NACJD) is a special topic archive of the Inter-university Consortium for Political and Science Research (ICPSR) at the University of Michigan. NACJD acquires, archives, processes, and provides access to electronic criminal justice data collections for research and instruction.
(ProQuest) - Provides government statistics, business, trade and research information, and private and international statistical information. U.S. government statistics go back to 1973 and private and state sources go back to 1980.
(Cornell University) - A search interface to the Roper Center for Public Opinion Research, a non-profit education and research organization that studies politics, government, public institutions, international relations, business, social affairs, and consumer behavior. Includes sources from major broadcasting and news organizations.