Official Archive
Project Blue Book’s 12,618 reports still have a traceable archival home
Worth Revisiting: the National Archives guide identifies the case files, finding aids, microfilm, photographs, film, and audio transferred from the Air Force.
Briefed August 7, 2026 · Aliens in the Clouds
Worth Revisiting
The National Archives’ Project Blue Book guide says the declassified collection includes roughly 37 cubic feet of chronological case files, additional project and Office of Special Investigations records, and finding aids indexed by date and location. Textual access is organized across 94 rolls of microfilm, with audiovisual material held by separate archival branches.
The Air Force recorded 12,618 sightings from 1947 through 1969 and categorized 701 as unidentified. That category records the outcome of the historical investigation; it does not identify an extraterrestrial cause. The same guide also demonstrates provenance checks by documenting the archival problems surrounding alleged MJ-12 material.
Why it matters
A finding aid and custody record let researchers locate the complete historical file, assess what investigators actually had, and separate an unresolved classification from claims added later.
Published by Aliens in the Clouds. These AI-assisted summaries link to their sources and distinguish reported claims from established findings. Skinny Ed is a fictional mascot; High Thoughts are comedy. Send a correction with its source.