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
282 Sec, et NOF0RN Chapter 6 The Hycon entry. designed by James Baker and known as the Type-IV camera, was a spotting camera with extremely-high-ground resolution. In fact, it was an advanced version of the highly reliable B camera developed for the original U-2 program. It used a 48-inch Baker-designed f/5.6 lens to focus images onto 9.5-inch tilm. Like the B camera it could provide seven frames of photography covering a swath 41 miles wide with stereo overlap on 19 miles of the swath. The Hycon camera carried the largest film supply of the three cameras, 12,000 feet. It was able to resolve 100 lines per millimeter and provide a ground resolution of 8 inches. A version of this 48-inch Hycon camera. known as the H camera, later saw service in u-2R air craft. Each of the three camera systems had unique capabilities and advantages, so all three were purchased for the OXCART. Before they could be effectively employed in the aircraft, however, new types of camera windows were needed. The OXCART's camera win dows had to be completely free from optical distortion. Achieving this goal was difficult in a window whose exterior would be sub jected to temperatures of 550"F whik the interior surface would be only IscrF. After three years and the expenditure of 52 million in re search and development, the Corning Glass Works, which had joined this effort as a Perkin-Elmer subcontractor, solved the problem of producing a camera window that could withstand tremendous heat differentials. Its quartz glass window was fused to the metal frame by an unprecedented process involving high-frequency sound ~.waves. Later in the program, the OXCART received yet another camera system. In 1964 the Texas Instruments Corporation developed an in frared camera for Project TACKLE U-2s that were being used to de termine whether the People's Republic of China was producing weapons-grade nuclear material. This stereo device, known as the FFD-4. was adapted for use in OXCART. The camera had an effective focal length of 50 inches and a 150-foot supply of 3.5-inch film. The camera's resolution was 3°C thermally, I milliradian spatially. and 60 feet on the ground. It could be used for both day and night imagery collection. '' Baker intcrvicw (S); Minnich. "OXCART Stury." pp. 5-o ISl. sec1et
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Official release, from the pursue collection. The PDF is mirrored here; the original link is under it. 406 pages are in the text index: search them above, or from the library's search.