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"HUD USER provides interested researchers with access to the original data sets generated by PD&R-sponsored data collection efforts, including the American Housing Survey, HUD median family income limits, as well as microdata from research initiatives on topics such as housing discrimination, the HUD-insured multifamily housing stock, and the public housing population."
The Pew Research Center is a nonpartisan, nonprofit "fact tank" that provides information on the issues, attitudes and trends shaping America and the world. They have data sets about 7 different areas.
The GSS contains a standard 'core' of demographic and attitudinal questions, plus topics of special interest. The GSS is widely regarded as the single best source of data on societal trends. Data is collected every even numbered year.
"The Bureau of Justice Statistics (BJS) is the primary statistical agency of the U.S. Department of Justice. BJS collects, analyzes, publishes, and disseminates information on crime, criminal offenders, victims of crime, and the operation of justice systems at all levels of government. The BJS Web site provides every publication released by BJS since 1995, with downloadable datasets and spreadsheets, online analytic capabilities, and graphical presentations."
"Uppsala Conflict Data Program (UCDP) at the department of Peace and Conflict Research, Uppsala University and the Centre for the Study of Civil War at the International Peace Research Institute Sweden have collaborated in the production of a dataset of armed conflicts, both internal and external, in the period 1946 to the present."