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Archive of posts published in the tag: Sign project
Oct
17

Sign project , definition and study. A-Z index of Cognitio.

Sign project , definition and study. A-Z index of Cognitio.

Sign project , definition and study. A-Z index of Cognitio. The Sign project was an official US government study on unidentified flying objects (UFOs) carried out in the United States by the United States. Air Force between 1947 and the end of 1948.…