Documents / Official release
This is a Secret History Staff monograph by Gregory W. Pedlow and Donald E. Welzenbach of the Central Intelligence Agency, published in 1992. It gives a history of the CIA's manned overhead reconnaissance program from 1954 to 1974, covering the development and operation of the U-2 and the A-12 OXCART aircraft. It covers overflights of the Soviet Union, the 1960 downing of Francis Gary Powers, and later operations. One section is titled "U-2s, UFOs, and Operation BLUE BOOK."
From the source:Release of 2026-06-12 This CIA History Staff document chronicles the complete history of the U-2 and OXCART (A-12) high-altitude reconnaissance aircraft programs from 1954 to 1974, detailing their development, operations over the Soviet Union and other targets worldwide, the famous downing of Francis Gary Powers in 1960, organizational reforms following that incident, and the eventual transfer of operations from CIA to Air Force control. A more redacted version of this document has been available on CIA's public website.
“Hill”15 pages
SeoFet NOF6ftrq Index 374 National Security Council Intelligence Directive (NSCID) 191 Nationalist China 319,215,224,226,229,236 Nationalist Chinese 201, 205, 222-226, 229-230, 234-237, 239-240, 243, 245-246, 253,257,319 Air Force 223,225 insignia 225 pilots 319,223,230,235,243,246,253 U-2 205, 223-224, 229, 246 Navajo missile 22 Naval Air Station at Atsugi, Japan 134 naval quarantine 210 Nehru, Jawaharlal 231~233 Nelson, Nonnan 68 Nevada 56-57, 341, 113, 130-131, 133, 149, 182, 241, 274, 283, 286, 290, 295, 297, 302-303, 31 I Nevada Proving Ground 56,241 New Delhi, India 232 Ngo Dinh Diem 230 NICE GIRL 310 nickel-cadmium batteries 240 Nile River 119 NIMBUS 200 1973 Middle East war 256,320 9th Tactical Air Force 330 nitrogen 64 Nixon, Richard M. 245-246, 256-257, 333 Nobel Prize 332 North American Air Defense Command (NORAD) 289 North Atlantic Treaty Organization (NATO) 20, 329, 87, 148, 172 radars 87 North Island Naval Base, California 248 North Korea 4,233,237,242,307 North Vietnam 190, 221-222, 230-231, 233, 243, 246-247, 301, 304-307, 311,336,342 North-East Frontier Agency (NEFA) 231 Northrop Aviation 259 Norton, Garrison 14-15, 31, 70,260,331 Norwalk, Connecticut 50 Norway 140, 142, 172, 176-177, 303,319 Norwegian Defense Staff 142 Norwegian Intelligence Service 142 Notre Dame University 7 Novaya Zemlya 172 Novokuznetsk, Soviet Union 138 nuclear energy 39, 81, 225 Nuclear Energy Division 39 -seOfeL
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Official release, from the pursue collection. The PDF is mirrored here; the original link is above. 406 pages are in the text index: search them above, or from the library's search.