ICPSR (datasets) This link opens in a new window
The Inter-University Consortium for Political & Social Research (ICPSR) maintains a dataset archive of research in the social and behavioral sciences. It hosts 21 specialized collections of data in education, aging, criminal justice, substance abuse, terrorism, and other fields.
Each study's dataset provides documentation (e.g. codebook), and a bibliography of published articles that used the data. Data offered in many formats.
Must create an ICPSR account to download data. Coverage: 1700s-present.