U.S. Code - is a compilation of all general and permanent laws. Its contents are gathered into 50 broad subject topics. This site allows you to search by keyword or citation.
Two printed versions are available: U.S. Code - Ref. U.S. Documents Y 1.2/5: U.S. Code Annotated - Ref. U.S. Documents KF625 .W45
Code of Federal Regulations - lists all the regulations from federal agencies currently in effect. Its arrangement, like that of the U.S. Code, is by 50 broad subjects.
Federal Register - is a daily publication to publicize newly proposed regulations and the adopted versions of regulations issued by U.S. government agencies.