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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.
“multiple objects”5 pages
U. S. Air Force Technical Information Sheet Question Punched Card Column Code Description I. f? • f V : HIT 39 Uq Ui U3* US 75* 76* 77* Hour Angle Angle of Elevation of the Sun 5. 15. U7* U8 U9. 5o 5l^ 53 5U 55^ 56* Group Classification Sun Bearing Angle Time Units Duration of Observation Groups Classification Hpw Observed 16a. 16b. 16b. 17. 19. lla. lib. 39. 17. 18. 2U. llf. 21. 22. 2U. 10, lie. 5. 1 1 . 17. 20. 33. 29. 31. 1. 23. 30. 31. 2. 31. 32. i>7* 5 8 * 59* 60* 61* 62* 63* 6U* 6 5 * 6 6 * 6 7 * 6 8 * 69* 7CH^ 71* Y2* 73* Sound Object Color Light Color Physical Color-Group Classification Number Speed Shape Description Size Light Brightness Angular Velocity Angular Acceleration UGI'1Gn Appearance bearing Disappearance Bearing Initial Elevation ^ . J.. Final Elevation D^oiipti Orientation Maneuvers Observer Occupation Observer Rating Observer Report Rating Reliability Group Classification Final Identification •* Denotes that separate code key is needed. 304
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.