Documents / FOIA release

(Analysis of Reports of Unidentified Aerial Objects)

Central Intelligence Agency · 2005-07-12 · 312 pages · text by OCR

This CIA-released copy of Project Blue Book Special Report No. 14 is dated 5 May 1955 and comes from the Air Technical Intelligence Center at Wright-Patterson Air Force Base. It is a statistical analysis of about 4,000 unidentified aerial object reports from 1947 through 1952, coded onto IBM punched cards with the help of a panel of scientists. The report concludes that such objects were highly unlikely to be technological developments beyond present-day scientific knowledge. It also found no valid evidence of physical matter.

Open the PDF at page 75 Original source ↗

“Midwest”11 pages

  • p. 6 …in the Strategic Areas of the Central Midwest Region 50 Figure 35 Comparison of Evaluation of…
  • p. 62 …COMPARISON OF EVALUATION OF OBJECT SIGHTINGS IN THE STRATEGIC AREA OF THE SOUTH MIDWEST REGION B…
  • p. 115 …Evaluation of Object Sightings in the Strategic Areas of the Central Midwest Region | 252 | | Table A237…
  • p. 254 …0.0 18.8 NORTH MIDWEST CENTRAL MIDWEST SOUTH MIDWEST Evaluation Number Per Cent Number Per…
  • p. 255 …0.0 8.0 NORTH MIDWEST CENTRAL MIDWEST SOUTH MIDWEST Evaluation Number Per Cent Number Per…
  • p. 257 …5 Evaluation CHICAGO DAYTON BALANCE OF CENTRAL MIDWEST Number Per Cent Number Per Cent Number Per…
  • p. 258 …CIA-RDP81R00560R000100060001-5 Evaluation ATLANTA WACO SAN ANTONIO BALANCE OF SOUTH MIDWEST Number Per Cent Number…
  • p. 259 …2 Evaluation CHICAGO DAYTON BALANCE OF CENTRAL MIDWEST Number Per Cent Number Per Cent Number Per…
  • p. 260 …CIA-RDP81R00560R000100060001-5 Evaluation ATLANTA WACO SAN ANTONIO BALANCE OF SOUTH MIDWEST Number Per Cent Number…
  • p. 261 …2 Evaluation CHICAGO DAYTON BALANCE OF CENTRAL MIDWEST Number Per Cent Number Per Cent Number Per…
  • p. 262 …CIA-RDP81R00560R000100060001-5 Evaluation ATLANTA WACO SAN ANTONIO BALANCE OF SOUTH MIDWEST Number Per Cent Number…
TABLE V CHI SQUARE TEST OF KNOWNS VERSUS UNKNOWNS ON THE BASIS OF DURATION OF OBSERVATION

Duration of Observation	Number of KNOWNS	Adjusted Number of KNOWNS(K)	Number of UNKNOWNS(n)	X2(K-n)2/K
5 sec or less	259	64	27	21.39
6-10 sec	92	23	21	0.17
11-30 sec	153	38	33	0.66
31-60 sec	108	26	42	9.85
61 sec-5 min	269	66	99	16.50
6-30 min	305	75	71	0.21
Over 30 min	135	33	37	0.48
Not stated	444	109	104	0.23
Total	1765	434	434	49.49
Degrees of freedom	7
5% 14.1
1% 18.5

Cases discussed

About this file

FOIA release, from the cia-readingroom collection. The PDF is mirrored here; the original link is under it. The text was read from the page images by an OCR model; expect the odd misread word. 312 pages are in the text index: search them above, or from the library's search.