The final report of the 12-member Presidential Commission (known as the "Kemeny Commission") appointd by President Jimmy Carter to investigate the accident and make recommendations based upon their findings. Another 10 volumes documented details of their investigation.
The final report of the Special Inquiry Group (known as the "Rogovin Report") sponsored by the NRC to independently investigate the accident and make recommendations based upon their findings. Another volume with three parts documented details of their investigations.
NUREG reports of internal NRC investigations documenting lessons learned specific to the accident and regulatory actions generic to the U.S. nuclear industry.
Reports of other investigations by the NRC and external organizations, such as the NRC Advisory Committee for Reactor Safeguards, Goverment Accountability Office, U.S. Congress, the State of Pennsylvania, and the licensee.