Google Uncle Sam
Searches .gov and .mil web sites only. Good for recent U.S. and state government information.
Monthly Catalog of United States Government Publications
Available online through Catalog of Government Publications (1976-current)
Print version: 1895-1994 available in government documents section.
This resource is the most comprehensive list of federal government publications.
Congressional Publications (1789 - Present)
Index and partial full-text [see digital content update] of Congressional prints, hearings, reports, legislative histories. Full-text of Serial Set documents produced from 1789 to 1969. Index to Congressional Record from 1985 - present.
American FactFinder, U.S. Census Bureau
Provides access to population, housing, economic, and geographic data.