Project Blue Book Special Report (second copy)

This is Project Blue Book Special Report No. 14, "Analysis of Reports of Unidentified Aerial Objects," Project No. 10073, dated 5 May 1955. The study reduced about 4,000 sighting reports received by the U.S. Air Force between June 1947 and December 1952 to IBM punched cards and analyzed them statistically, including chi square tests comparing knowns with unknowns. It concludes that the reports very probably do not represent technological developments beyond present scientific knowledge, and it notes that no case produced physical evidence.

Therefore, on the basis of this evaluation of the information, it is
considered to be highly improbable that reports of unidentified aerial
objects examined in this study represent observations of technological
'developments outside of the range of present-day scientific knowledge,
is emphasized that there was a complete lack of any valid evidence con-
sisting of physical, matter in any case of a reported unidentified aerial
object.
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