The redacted document can be found at the CIA's library at https://www.cia.gov/library/center-for-the-study-of-intelligence/kent-csi/vol11no1/html/v11i1a04p_000

The redacted document can be found at the CIA's library at https://www.cia.gov/library/center-for-the-study-of-intelligence/kent-csi/vol11no1/html/v11i1a04p_0001.htm https://www.cia.gov/library/center-for-the-study-of-intellig... Note that it doesn't say when this happened, only "number of years ago" from when the document was written in 1967.