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Federal Legislative History

This guide provides an overview of how to locate federal legislative history.

About is the official website for U.S. federal legislative information. It is also free. 

  • accurate, timely, and complete legislative information for every bill and resolution since 1973
  • presented by the LOC using data from:
    • the Office of the Clerk of the U.S. House of Representatives,
    • the Office of the Secretary of the Senate,
    • the Government Publishing Office,
    • Congressional Budget Office, and
    • the LOC’s Congressional Research Service.

Search by Pub. L Number

Using advanced search on, you can enter your public law number, and select the relevant congressional session. For example, in the circled area, you could enter "101PL549" (101st Congress, 549th enacted bill) and narrow your search to information from Congressional sessions from 1973 -2022.  This is the Public Law Number for the Clean Air Act Amendments of 1990. 


You can receive fairly comprehensive results, including a summary, bill text, actions on the bill, amendments to the bill, cosponsors, committees, and references to congressional reports.  

Committee Reports

Committee Reports are often seen as the most important document in legislative history. The House, Senate, and Joint Conference Committees can all issue reports, which may analyze the intent of the proposed legislation and the committee's rationale for recommending a bill. 

Committee reports are available on from 1995 (104th Congress) forward. You may search for Committee Reports using the drop down menu available on

Free access to historical committee reports requires more effort.  Selected materials appear in Century of Lawmaking (1774-1875). For more information, the Library of Congress has a guide devoted to finding historic Congressional Committee Reports


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