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Project Blue Book Special Report (second copy)

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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.

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  • p. 3 TABLE OF CONTENTS Page SUMMARY • vii 1 INTRODUCTION 1 ORIGIN AND NATURE OF DATA 3 REDUCTION…
  • p. 9 …This would include such items as natural phenomena that are not yet completely understood, ps^cjioliigical…
  • p. 11 …ORIGIN AND NATURE OF DATA Reports of sightings were received by the U. S. Air Force…
  • p. 14 …Since it was impracticable to transfer detailed data of an exact nature from the questionnaire to…
  • p. 19 …as misinterpre- tatiorxs of common objects or natural phenomena. Accordingly, categories for objects most frequently present…
  • p. 20 …A separate category for the uncommon natural phenomena associated with light reflections or refractions, such as…
  • p. 21 …of the common objects or as a natural phenomenon, and his opinion was that the sighting…
  • p. 76 …aircraft, balloons, or other known objects or natural phenomena. The UNKNOWNS might still be unidentified KNOWNS…
  • p. 99 …a familiar object or to a known natural phenomenon. (4) The model should be derived from…
  • p. 101 …to this problem.--The reason for the nature of this publicity was clearly brought out during…
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STUDY NO. IO2-EL-55/2-79
ANALYSIS OF REPORTS OF
UNIDENTIFIED AERIAL OBJECTS
PROJECT NO. 10073
5 MAY 1955
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Report, cited by the archive. The PDF is mirrored here; the original link is under it. 309 pages are in the text index: search them above, or from the library's search.