The United States Air Force conducted Project Blue Book (which included the previous projects Project Sign and Project Grudge) from 1947 until 1969.

Authors

• Person: Not available Organization: Wikipedia
  Unidentified flying object - Wikipedia

Sources

• Unidentified flying object - Wikipedia en.wikipedia.org Wikipedia via serper

Referenced by nodes (5)

• United States Department of the Air Force entity
• Project Blue Book event
• Project Blue Book concept
• Project Sign concept
• Project Sign event