Alphabetically arranged, this guide contains references to important primary sources of statistical information for the United States. Secondary sources have been included if the information contained in them is presented in a particularly convenient form or if primary sources are not readily available. Nonrecurrent publications presenting compilations or estimates for years later than 1990, or types of data not available in regular series, are also included. Data are also available in press releases.

http://www.census.gov/compendia/statab/guide_to_sources.html