Contains an extensive listing of 1,500 UFO sightings and cases from the US Air Force Project Bluebook files that remained 'unknown' or 'unidentified' after investigation. This is out of a total of 12,000. The original number of 'unknowns' in Project Bluebook was approx. 700, however this author has compiled an extended listing of 'unknowns' higher than the 'official' and original number of 700 'unknowns'. This catalog by the author contains 1,500 'unknowns' from Bluebook.Click on the image to download the PDF.
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Source: http://www.ufoevidence.org/topics/generalsightings.htm
