Searches across 39 molecular and literature database maintained by NCBI (the National Center for Biotechnology Information). Results are listed by database so a single search can lead to discover of different types of data. Good for a broad overview.
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Sage Data (formerly Data-Planet) is an interactive database that allows users to create tables, maps, and figures from a variety data sources covering banking, criminal justice, education,energy, food and agriculture, government, health, housing and construction,industry and commerce, labor and employment, natural resources and environment, income, cost of living, stocks, transportation, and more.
This search engine provides access to free journal articles, peer-reviewed accepted manuscripts, and reports of research funded by federal science agencies. Topics include health and science, agriculture, environment, informatics, etc.
The Senate Executive Journals are the minutes of the meetings of the U.S. Senate - an official record of business on petitions, memorials, motions, bills, resolutions, and the votes on them.
Published between 1879-2012 by the U.S. Census Bureau, sources of data include the Census Bureau, Bureau of Labor Statistics, Bureau of Economic Analysis, and many other Federal agencies and private organizations. Ceased publication after 2011.