Don't reinvent the wheel. There are many published compilations of legislative histories in our collection and elsewhere.
Information here will help you locate these collections
Hein Online Federal Legislative History Library
Proquest Legislative Insight - Provides pdf access to more than 18,000 legislative histories covering laws from 1929 to the present.
BLS Library has compilations of legislative histories of major legislation such as the Patriot Act and ADA Act.
You can browse our collection of legislative histories by performing the following subject search in SARA.
If you want to check for a specific piece of legislation, use the Keyword option using the phrase "legislative history" and words from the title of the law.
Check the sources below to see if a compiled legislative history exists for the law you are researching. These books may be found in the First Floor Reference Collection of the Library.
Union list of legislative histories / compiled by the Law Librarians' Society of Washington, D.C., Inc.,Legislative Research Special Interest Section
Federal Legislative Histories by 
Sources of Compiled Legislative Histories by