These are tools for finding information from the Congress and Executive agencies of the U.S. Federal Government.
U.S. Congress -- Sites and Publications
Official government sites and important publication series.
Congressional Research Service, Congressional Budget Office, etc.
Access to nearly every document created by Congress, including committee hearings.
Basic finding tool for publications from a wide range of agencies.
Probably the world's most authoritative source for demographic information, including 2010 Decennial Census of Population data.
Statistical Abstract of the United States
Annual publication is the single most useful statistical collection (1878-2013).
ProQuest Statistical Insight
Searchable database of 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.