November 3, 2004 letter from John Helgerson, Inspector General of CIA to the Chair of the IOB. The letter refers to the OIG's May 2004 Report of Special Review, Counterterrorism Detention and Interrogation Activities (September 2001-0ctober 2003) and notes the IOB requested source documents referenced in that report. Those source documents appear to be attached to this letter, however, 34 pages were withheld in full.