Electronic Statistics Textbook. StatSoft, Inc. (2013). Tulsa, OK: StatSoft.
"The Electronic Statistics Textbook begins with an overview of the relevant elementary (pivotal) concepts and continues with a more in depth exploration of specific areas of statistics, organized by "modules" and accessible by buttons, representing classes of analytic techniques. A glossary of statistical terms and a list of references for further study are included."
From Sheridan Libraries at Johns Hopkins University. A great place to start when looking for datasets. Clear description of sources with categoreis for demographics, economics, education, health and ICPSR. Another great tool by a librarian: Jen Darragh
Great site from the University of Chicago. Includes a comprehensive list for economic, education, health, public opinion, statistics and software. You won't be able to access everything, but it is a good place to start.