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ICPSR -- Inter-University Consortium for Political and Social Research
Provides access to a vast archive of social science data. ICPSR's data holdings are for use with statistical software, such as SAS, SPSS, and Stata.
A unit within the Institute for Social Research at the University of Michigan, ICPSR has over 640 member colleges and universities around the world. First time users must create an account. ICPSR is funded with support from the ODU Office of Research. Access here or from the Find Databases A-Z link.