Legislation
Americans with Disabilities Act of 1990 (ADA)
Full text of the 1990 Act prior to the 2008 Amendments:
ADA Amendment Act of 2008 (ADAAA)
Full text of the current ADA, incorporating all amendments from the ADAAA: https://www.ada.gov/pubs/adastatute08.htm
Text showing the changes to the Americans with Disabilities Act of 1990 made by the ADA Amendments Act of 2008, with deleted language shown as strike through font and new language shown in bold font: https://www.ada.gov/pubs/adastatute08mark.htm
Individuals with Disabilities Education Act (IDEA)
IDEA was referred to as the Education For All Handicapped Children Act or "EHA" Act from 1975-1990. In 1990, the EHA was reathorized and renamed the Individuals with Disabilities in Education (IDEA) Act. Full text of the 1990 version with all updates, as the text currently appears in the House of Representatives records:
https://uscode.house.gov/view.xhtml?path=/prelim@title20/chapter33&edition=prelim