Department of Energy [ http://www.energy.gov/ ]
Governmental department whose mission is to advance energy technology and promote related innovation in the United State.

NASA [ http://www.nasa.gov/ ]
An agency of the United States Government, responsible for the nation's public space program.

National Science Foundation [ http://www.nsf.gov/ ]
Education and human resources directorate.

White House [ http://www.whitehouse.gov/ ]
Whitehouse.gov is the official web site for the White House and President of the United States.

U.S. Copyright Office [ http://www.copyright.gov/ ]
US Copyright Office is an office of public record for copyright registration and deposit of copyright material.

Energy Star [ http://www.energystar.gov/ ]
ENERGY STAR is a government-backed program helping businesses and individuals protect the environment through superior energy efficiency.

U.S. Environmental Protection Agency [ http://www.epa.gov/ ]
Committed to protecting the natural environment.

US Fish and Wildlife Service [ http://www.fws.gov/ ]
A unit of the United States Department of the Interior that is dedicated to managing and preserving wildlife

Grants.gov [ http://www.www.grants.gov/ ]
Provides a unified site for interaction between grant applicants and the US Federal agencies that manage grant funds.

United States House of Representatives [ http://www.house.gov/ ]
Information on the lower body of the federal legislature: about the legislative process, this week's House calendar, committee schedules, roll call vote ...

Regulations.gov [ http://www.regulations.gov/ ]
Portal for Federal rulemaking. Allows the public to find, review, and submit comments on Federal documents that are open for comment.

Oak Ridge National Laboratory - Building on a History of Science [ http://www.ornl.gov/ ]
Oak Ridge National Laboratory (ORNL) conducts basic and applied research and development to create scientific knowledge and technological solutions.

The Library of Congress [ http://www.loc.gov/ ]
The Library of Congress is the nation's oldest federal cultural institution, and it serves as the research arm of Congress. It is also the largest library in the world, with more than 120 million items. The collections include books, sound recordings, motion pictures, photographs, maps, and manuscripts.

National Oceanic and Atmospheric Administration [ http://www.noaa.gov/ ]
NOAA is a federal agency focused on the condition of the oceans and the atmosphere. It plays several distinct roles within the Department of Commerce.

National Renewable Energy Laboratory (NREL) [ http://www.nrel.gov/ ]
The National Renewable Energy Laboratory (NREL) is the DOE's primary laboratory for renewable energyand energy efficiency research and development.

US Department of State [ http://www.state.gov/ ]
US Department of State

United States Department of Agriculture [ http://www.usda.gov/ ]
Home page of United States Department of Agriculture.

United States Department of Health and Human Services [ http://www.dhhs.gov/ ]
HHS.gov is the website for the United States Department of Health and Human Services, led by Secretary Mike Leavitt, and based in Washington, DC.