By Walter Bedell Smith, Director of the CIA, 1 January 1952
(Central Intelligence Agency, Washington, D.C.)
Source: Internet Archive (archive.org)
The memorandum was sent to Director, Psychological Strategy Board.
Quote from the document (Page 4):
“FACTS BEARING ON THE PROBLEM:
5. ATIC has roughly 20 percent of its cases in the ‘unexplained’ category.
6. Of this 20 percent they feel that 10 percent would remain unexplained even with a full measure of available information. This residue of as-yet-unexplainable reports was aptly described as a group of ‘incredible reports from credible observers.’ ”
Internet Archive text:
“Document number CIA-RDP81R00560R000100020017-2 declassified and released through the CIA’s CREST database. Previously available only on four computers located outside of Washington D.C., the Agency was successfully pressured into putting the files online as a result of a MuckRock lawsuit and the efforts of Emma Best. The metadata was collected by Data.World, and the files are now being archived and made text searchable by the Internet Archive.”
Wikipedia article: “Walter Bedell Smith”: