After a bill becomes a law, it is assigned a public law number and paginated for the Statutes at Large volume that covers that session of Congress. The law numbers are sequential starting at the beginning of each Congress. For example, the first public law of the 105th Congress is designated Public Law 105-1.
Public laws are available in THOMAS for the 93d through 111th Congress.
A law is first issued in pamphlet form as a slip law. Eventually these are bound into the Statutes at Large and later codified into the United States Code.
For laws passed after 1970, subject access with complete legislative history can be found in: