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Project Bluebook (1949-1969) was the official U.S. Government investigation into UFOs that replaced Projects Grudge (1949-1951) and Sign (1947-1949). Headquartered at Wright-Patterson AFB, the investigations were handled by the U.S. Air Force. Without going into a lot of detail that would distract from the subject, there were thirteen reports prepared from the raw information gathered by those investigations. The reports were numbered 1-12 and 14.