Documents / Case file
This CIA archives copy, released in 2026, holds Project Blue Book Special Report No. 14 (Analysis of Reports of Unidentified Aerial Objects). The Air Technical Intelligence Center at Wright-Patterson Air Force Base issued it on 5 May 1955. The study reduced about 4,000 sighting reports from 1947 to 1952 to IBM punched cards, with 3,201 cases charted, and applied chi square tests to compare known and unknown sightings. It concludes that it is highly improbable the reports represent technological developments beyond present-day scientific knowledge.
From the source:Release of 2026-06-12 This is the USAF Project Blue Book with a CIA cover sheet stating the document is "Official Record Copy." With the exception of the handwritten note on the first page, the content of this document has been available on CIA's public website.
“The Unexplained Files”1 page
I I TABLE OF CONTENTS I SUMMARY. vii I INTRODUCTION ORIGIN AND NATURE OF DATA 3 I REDUCTION OF DATA TO MECHANIZED COMPUTATION FORM 4 I Questionnaire . 4 Coding System and Work Sheet 6 Identification of Working Papers. 7 Evaluation of Individual Reports 10 I ANALYSIS OF THE DATA. 14 I Frequency and Percentage Distributions by Characteristics 14 Graphical Presentation . 16 Advanced Study of the Data 16 Position of the Sun Relative to the Observer 16 Statistical Chi Square Test 60 The "Flying Saucer" Model 76 I CONCLUSIONS 94 I APPENDIX A. TABULATION OF FREQUENCY AND PERCENTAGE DISTRIBUTIONS BY CHARACTERISTICS 95 APPENDIX B. WORKING PAPER FORMS 255 Figure l I Figure 2 I Figure 3 I Figure 4 Figure 5 I Figure 6 Figure 7 I Figure 8 I Figure 9 I Figure 10 I Figure 11 Figure 12 I Figure 13 I I LIST OF ILLUSTRATIONS Frequency of Sightings by Year for Object, Unit, and All Sightings 17 Distribution of Evaluations of Object, Unit, and All Sightings for All Years 18 Distribution of Object Sightings by Evaluation for All Years With Comparisons of Each Year for Each Evaluation Group • 19 Distribution of Object Sightings by Evaluation for All Years and Each Year 20 Distribution of Object Sightings by Evaluation Within Months for All Years 21 Distribution of Object Sightings by Certain and Doubtful Evaluations for All Years and Each Year • 22 Frequency of Object Sightings and Unknown Object Evaluations by Months, 1947-1952. 23 Distribution of Object Sightings by Sighting Reliability Groups With Evaluation Distributions for Each Group . 24 Distribution of Object Sightings Among the Four Sighting Reliability Groups for All Years and Each Year . 25 Distribution of All Sightings by Sighting Reliability Groups, Segregated by Military and Civilian Observers, With Evaluation Distribution for Each Segregation 26 Distribution of Object Sightings by Reported Colors of Object(s) With Evaluation Distribution for Each Color Group • 27 Distribution of Object Sightings by Number of Objects Seen per Sighting With Evaluation Distribution for Each Group 28 Distribution of Object Sightings by Duration of Sighting With Evaluation Distribution for Each Duration Group . 29 iii I
Case file, from the pursue collection. The PDF is mirrored here; the original link is above. 312 pages are in the text index: search them above, or from the library's search.