General Sources & Guides to Government Information:

USA.gov--official site for searching for U.S. Government information
FDsys—from the Government Printing Office
FedWorld Information Network(Dept. of Commerce)
Thomas—Legislative Information from the Library of Congress
Documents Data Miner (Wichita State University)

Search Engines for Government Information:

SearchGov (searches federal, state & local websites)
SearchMil (searches U.S. military websites)

Selected Basic Sources:

Arts & Humanities Sites:

American Memory Historical Collections
Center for the Book (Library of Congress)
Cooper Hewitt, National Design Museum
Freer Gallery of Art & Arthur M. Sackler Gallery
Hirshhorn Museum & Sculpture Garden
National Museum of African Art
National Museum of American History
National Museum of the American Indian
National Portrait Gallery
National Register of Historic Places
Naval Historical Center
Presidential Libraries
Smithsonian Center for Folklife & Cultural Heritage
U.S. Army Center for Military History
U.S. Holocaust Memorial Museum

Business & Economics Sites:

America's Job Bank
Beige Book (Current Economic Conditions/Federal Reserve)
Consumer Price Indexes
Economic Report of the President
Economic Research Service (USDA)
Economic Statistics Briefing Room (White House)
Economy at a Glance
Fed in Print (Federal Reserve)
U.S. Housing Market Conditions
IGNET (Inspectors General)
Income Statistics (Census Bureau)
Labor Force Statistics (Census Bureau)
Labor Force Statistics (Bureau of Labor Statistics)
Monthly Labor Review
North American Industry Classification System
Occupational Outlook Handbook
Occupational Outlook Quarterly
Poverty Statistics (Census Bureau)
Survey of Current Business
Treasury Bulletin
Treasury Financial Manual

Crime, Justice, & Law Sites:

Education Sites:

America's Children: Key National Indicators of Well-Being
Condition of Education
Digest of Education Statistics
ERIC—Educational Resources & Instruction Clearinghouse
National Assessment of Educational Progress
Projections of Education Statistics

Public Policy Sites:

Bureau of Population, Refugees & Migrations (State Dept.)
Human Rights (State Dept.)
Freedom of Information Act Electronic Reading Room (State Dept.)
Homeland Security
McNair Papers (Institute for Strategic Studies)
United States Participation in the United Nations
Weekly Compilation of Presidential Documents

Science Labs & Centers:

Alaska Volcano Observatory (USGS)
Ames Laboratory (DOE)
Ames Research Center (NASA)
Argonne National Laboratory (DOE)
Atlantic Oceanographic & Meterological Laboratory (NOAA)
Brookhaven National Laboratory (DOE)
Carbon Dioxide Information Analysis Center
Columbia Environmental Research Center (USGS)
FBI Laboratory
Fermi National Accelerator Laboratory (DOE)
Fort Collins Science Center (USGS)
Goddard Institute for Space Studies (NASA)
Goddard Space Flight Center (NASA)
Glenn Research Center (NASA)(Cleveland)
Great Lakes Environmental Research Laboratory (NOAA)
Great Lakes Science Center (USGS)
Harvard-Smithsonian Center for Astrophysics
Hawaiian Volcano Observatory (USGS)
National Human Genome Research Institute
Institute for Telecommunication Sciences
Jet Propulsion Laboratory (NASA)
Johnson Space Center (NASA)
Kennedy Space Center (NASA)
Lawrence Livermore National Laboratory (DOE)
Los Alamos National Laboratory (DOE)
National Air & Space Museum
National Center for Biotechnology Information
National Center for Health Statistics
National Geophysical Data Center (NOAA)
National Hurricane Center
National Museum of Natural History
National Oceanographic Data Center
National Space Science Data Center (NASA)
National Wetlands Research Center (USGS)
Northeastern Research Station (USDA Forest Service)
North Central Research Station (USDA Forest Service)
Northern Prairie Wildlife Research Center
U.S. Naval Oceanography Portal
Oak Ridge National Laboratory (DOE)
Rocky Mountain Research Station (USDA Forest Service)
Sandia National Laboratories (DOE)
Southern Research Station (USDA Forest Service)
Upper Midwest Environmental Sciences Center (USGS)

Other Science & Technology Sites:

Endangered Species Program
Minerals Yearbook
National Wetlands Inventory
North American Breeding Birds Survey
Physical Reference Data
President's Commission for the Study of Bioethical Issues
Water Resources of the U.S.