Get quick and easy access to current and historical U.S. census data and demographic information. Covers 1790 - 2010.
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Search the statistical abstracts of 40 countries at one time. Statistical abstracts provide a point of entry to the vast array of data available about countries.

U.S. public opinion poll data, organized at the question level from the Roper Center, 1942 - current.
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A vast index of statistics produced by federal agencies, states, and intergovernmental organizations. A great place to start if you're not sure who has collected data relevant to your research.