The database has over 2.1 million full-text dissertations and theses. It also contains indexing of 3.8 million graduate works. Primarily US, UK and Ireland but increasingly from other countries. Designated as an official offsite repository for the U.S. Library of Congress. Coverage: 1861-present.
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.
Visualize and map thousands of socioeconomic variables covering the United States (local to national). Create reports on specific Census geographies. Download reports, data, and maps. Coverage: 2000-present.
Public opinion polling data from U.S. and international polling firms on a broad range of topics including opinions and behavior on social issues, politics, pop culture, international affairs. Download datasets and tables. Coverage: 1935 to present.