Documents / FOIA release
This is a CIA History Staff monograph by Gregory W. Pedlow and Donald E. Welzenbach, written in 1992 and approved for release in 2011. It covers the CIA's manned overhead reconnaissance program from 1954 to 1974 and its two aircraft, the U-2 and the A-12 OXCART. It follows their development, the overflights of the Soviet Union, the downing of Francis Gary Powers in 1960, and later operations. One section is titled "U-2s, UFOs, and Operation BLUE BOOK."
“The Pentagon”9 pages
Chapter 2 51 A- 1 camera 005653421 UNCLASSIFIED his research associate duties at Harvard and his service on govern- ment advisory bodies, Baker established a small firm known as Spica, Incorporated, on 31 January 1955. The A-1 camera system consisted of two 24-inch K-38 framing cameras. One was mounted vertically and photographed a 17.2° swath beneath the aircraft onto a roll of 9.5-inch film. The second K-38 was placed in a rocking mount so that it alternately photographed the left oblique and right oblique out to 36.5° onto separate rolls of 9.5-inch film. The film supplies unwound in opposite directions in order to minimize their effect on the balance of the aircraft. Both cameras used standard Air Force 24-inch focal-length lenses adjusted for max- imum acuity by Baker. The development of the special rocking mount by Perkin-Elmer's Dr. Roderic M. Scott was a major factor in reduc- ing the size and weight of the A-1 system, because the mount pro- vided broad transverse coverage with a single lens, ending the need for two separate cameras:6 OSA History, chap. 1, annex 3. pp. 1-3 (TS Codeword). ret UNCLASSIFIED
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FOIA release, from the cia-readingroom 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.