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Many legislative histories have already been compiled. Here are some library databases that provide compiled full-text or a compiled citation list for legislative histories:
HeinOnline has an extensive collection of compiled legislative histories. To access legislative histories, login to HeinOnline and then go the U.S. Federal Legislative History Library.
(Formerly LexisNexis Congressional.) A comprehensive source of Congressional information including bills, hearings, testimonies, and legislative histories.
Federal legislative history service providing full-text digital access to Congressional publications created during the legislative process leading up to the enactment of a U.S. Public Law.
Introduction to the U.S. Legislative Process (CRS)