U.S. Code -- The general and permanent laws of the United States.
Code of Federal Regulations -- The Code of Federal Regulations contains the text of public regulations issued by the agencies of the Federal government.
THOMAS -- Detailed legislative information from the Library of Congress, including full text of bills, committee reports, and resolutions.
The Congressional Record -- This searchable database includes the text of the Congressional Record, which is the published account of the debates, proceedings, and activities of the United States Congress.