UFOs: Fact or Fiction?
This collection catalogues CIA information on this subject from the 1940s through the early 1990s. Most of the documents concern CIA cables reporting unsubstantiated UFO sightings in the foreign press and intra-Agency memos about how the Agency handled public inquiries about UFO sightings.
For the most recent CIA information on UFOs, see the article “CIA’s Role in the Study of UFOs, 1947-90” at the Center for the Study of Intelligence website (https://www.cia.gov/library/center-for-the-study-of-intelligence/index.html). The article is located in On-line Publications under the “Studies in Intelligence” section, specifically semi-annual Edition #1, 1997.
CIA UFO Library website