A legislative history traces the development of a law from its original consideration to enactment of the statute. It cites a collection of documents that provide the background and actions that lead to the public law. These include bills, hearings, reports, debates, and presidential signing statements. In some cases, you may find a compiled legislative history (see below) , but it is more likely you will need to develop the history through locating lists of citations.
The most comprehensive resource is Congressional Publications, which includes Legislative Histories from 1969 to the present. The citation lists include bills, prints, hearings, reports, debates, signing statements, and many of these documents can be accessed online directly from the citation.
These sources are not comprehensive!