Project Blue Book

11 declassified cases mention this

• PDF · 1971CIA-UAP-019, Australian Dept of Defense Scientific and Intel Aspects of the UFO Problem
• PDF · 1967DOW-UAP-D092, Department of the Air Force Committee to Review Project Bluebook, 1966-1967
• PDF · 1955DOW-UAP-D096, Correspondence Relating to Project Blue Book, 1955
• PDF · 1954CIA-UAP-003, The Central Intelligence Agency and Overhead Reconnaissance; The U-2 and OXCART Programs, 1954-1974
• PDF · 1953CIA-UAP-007, Current Status Of Unidentified Flying Objects (UFO) Project.
• PDF · 1952CIA-UAP-002, Scientific Advisory Panel on Unidentified Flying Objects, Report, 1952-1953
• PDF · 1952FBI-UAP-D012, Newark Field Office, 1952-1967
• PDFCIA-UAP-015, Project Blue Book Special Report No. 14 (Analysis of Reports of Unidentified Aerial Objects)
• PDFDOW-UAP-D087, U.S. Air Force Analysis of Flying Objects in the United States, 1-100
• PDFDOW-UAP-D088, U.S. Air Force Analysis of Flying Objects in the United States, 101-172
• PDF255_413270_UFO's_and_Defense_What_Should_we_Prepare_For