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.
“The Advance”34 pages
381 security 2, 27, 40-41, 43, 55, 59-60, 72, 8 1, 94, 112, 125, 127, 140, 161. 167, 185. 187-188. 191. 197,201,209, 212, 218, 221-222, 224, 236, 256, 273, 283-284, 294, 318, 327 Security, Office of 59, 112, 222 Semipalatinsk, Soviet Union 128, 138-139, 147, 168 SENSINT--Sensitive Intelligence 3 sensors 11, 22. 241, 292, 3 I0 Seventh Air Division 89 Severodvinsk. Soviet Union 172, 176 Shanghai. China 222, 228, 242 sheep-dipping 74 Shell Oil Company 62. 328 shellfi sh toxin 125 Shelton, William - - - 125, 176 shock wave 290-291 short-range reconnaissance vehicle 342 show 1rial 183 Shuangchengzi, China 226, 228. 235 shutter assemblies 53 Siberia 3 Sichuan, China 230 Sicily 116 Sieker, Robert 131 Sierra snowfield 254 SIGINT Committee 332 Signals Intelligence (SIGINT) 222 Index Sinai penins1ula 117 "single-pass'" mission 306 Sino-Indian border 231-2:33. 319 Sino-Soviet lborder 336 "Skonk Works" 45 Skunk Work:s 45, 71, 132. 251. 262, 273-274 SKYLARK 299 Smithsonian Institution 55 "snap-up" 148 Snark missil,:s 22 Snider, Sammy V. C. 138 snowmelt 254 SOFT TOUCH 135, 139, 143 software algorithms 52 solar cells 240 solid-fueled imissiles 161.3 17 sound barrier 289 SOUTH GATE 2 16 South Vietnam 230-231, 243, 301. 305 Southeast Asia 190,198,216, 221.301, 310 Sovetskaya Gavan'. Soviet Union 144 Soviet B loc 1-2. 4, 6. 16-20. 87. 93. 112. 123. 147. 152,159. 19~ 197,211.330 Soviet Communist Party Congress 160 Soviet Far East 134,144
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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.