U.S. Government Documents catalogs links

Catalog of U.S. Government Publications

http://catalog.gpo.gov/

Find current and historical information for United States publications. Provides links to full-text publications online.

MetaLib for Government Documents

http://metalib.gpo.gov/ 

Searches multiple federal government databases simultaneously and retrieves full-text items or provides citation information for a document.

THOMAS Catalog (Library of Congress)

http://www.thomas.gov/

Search for legislative bills, bill sponsors, and other historical full-text documents via the Library of Congress

US Census Bureau search

http://factfinder2.census.gov/faces/nav/jsf/pages/index.xhtml

American Fact Finder provides data and maps based on census and surveys conducted.