CFR
Code of Federal Regulations searchable by code section or keyword.
Government Printing Office (GPO)
Provides access to government publications including the Federal Register, Congressional Record, US Code
Thomas
Congressional legislative information including bills, committee reports, and retrieval of public laws by number (93rd - 107th sessions).
U.S. Code
The Office of Law Revision Counsel provides a searchable official version of the U.S. Code. This database provides several types of advance searches. It is possible to restrict your keyword search by title, section, subtitle, etc.... Another type o