https://irp.fas.org/program/collect/u2.pdf; National Security Agency, https://nsarchive2.gwu.edu/NSAEBB/NSAEBB54/docs/doc_40.PDF
139 ↑ Ibid.
140 ↑ Bruce Berkowitz, A Brief History of the NRO (NRO Center for the Study of National Reconnaissance, 2018, https://www.nro.gov/Portals/65/documents/history/csnr/programs/NRO_Brief_History.pdf; National Reconnaissance Office, https://www.nro.gov/History-and-Studies/Center-for-the-Study-of-National-Reconnaissance/The-CORONA-Program/; Dwayne Day, et, al., eds., Eye in the Sky: The Story of the Corona Spy Satellites (Smithsonian, 1998)
141 ↑ U.S. Air Force, https://www.nationalmuseum.af.mil/Visit/Museum-Exhibits/Fact-Sheets/Display/Article/195801/avro-canada-vz-9av-avrocar/
142 ↑ Ibid.
143 ↑ American Heritage Center, "Flying Saucers—For Real! The Papers of Jack D. Pickett," https://ahcwyo.org/2022/04/04/flying-saucers-for-real-the-papers-of-jack-d-pickett/
144 ↑ U.S. Air Force, https://www.nationalmuseum.af.mil/Visit/Museum-Exhibits/Fact-Sheets/Display/Article/195801/avro-canada-vz-9av-avrocar/
145 ↑ American Heritage Center, "Flying Saucers—For Real! The Papers of Jack D, Pickett," https://ahcwyo.org/2022/04/04/flying-saucers-for-real-the-papers-of-jack-d-pickett/
146 ↑ National Aeronautics and Space Administration, https://www.jpl.nasa.gov/missions/explorer-1
147 ↑ National Security Archive, https://nsarchive2.gwu.edu/NSAEBB/NSAEBB74/
148 ↑ Central Intelligence Agency, https://www.cia.gov/legacy/museum/exhibit/a-12-oxcart/
149 ↑ Central Intelligence Agency, https://www.cia.gov/legacy/museum/exhibit/a-12-oxcart/; National Security Agency Archive, https://nsarchive2.gwu.edu/NSAEBB/NSAEBB74/
150 ↑ Ibid.
151 ↑ National Air and Space Museum, https://airandspace.si.edu/stories/editorial/what-was-mercury-program
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