Contains references to tens of thousands of data sources from the U.S. Federal Government, U.S. state governments, international intergovernmental organizations, and private sector groups, such as trade and professional associations.
Each of these agency sites is comprised of a large number of subject-themed sections, as well as search options. Researchers really need to spend time exploring a site to find out what's possible.
These are tools for finding information from the Congress and Executive agencies of the U.S. Federal Government.
This is almost certainly the most comprehensive database of Congressional publications, some dating back as far as the late 1700's. Includes the complete texts of hearings and most other documents. An interesting sub-set of the database provides legislative histories. (Law Library subscription.)