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Thomas E. Bullard, “UFOs: Lost in the Myths”, pages 141–191 in “UFOs, the Military, and the Early Cold War Era”, pages 82–121 in “UFOs and Abductions: Challenging the Borders of Knowledge” David M. Jacobs, editor; 2000, University Press of Kansas, ISBN 0-7006-1032-4

Jerome Clark, The UFO Book: Encyclopedia of the Extraterrestrial, 1998, Visible Ink Press, ISBN 1-57859-029-9. Many classic cases and UFO history provided in great detail; highly documented.

J. Deardorff, B. Haisch, B. Maccabee, Harold E. Puthoff (2005). "Inflation-Theory Implications for Extraterrestrial Visitation". Journal of the British Interplanetary Society 58: 43–50. (links to pdf file)

Curran, Douglas. In Advance of the Landing: Folk Concepts of Outer Space. (revised edition), Abbeville Press, 2001. ISBN 0-7892-0708-7. Non-sensational but fair treatment of contemporary UFO legend and lore in N. America, including the so-called “contactee cults.” The author traveled the United States with his camera and tape recorder and directly interviewed many individuals.

Hall, Richard H., editor. The UFO Evidence: Volume 1. 1964, NICAP, reissued 1997, Barnes & Noble Books, ISBN 0-7607-0627-1. Well-organized, exhaustive summary and analysis of 746 unexplained NICAP cases out of 5000 total cases — a classic.

Hall, Richard H. The UFO Evidence: A Thirty-Year Report. Scarecrow Press, 2001. ISBN 0-8108-3881-8. Another exhaustive case study, more recent UFO reports.

Hendry, Alan. The UFO Handbook: A Guide to Investigating, Evaluating, and Reporting UFO Sightings. New York: Doubleday & Co., 1979. ISBN 0-385-14348-6. Skeptical but balanced analysis of 1300 CUFOS UFO cases.

Hynek, J. Allen. The UFO Experience: A scientific inquiry. Henry Regnery Co., 1972.

Hynek, J. Allen. The Hynek UFO Report. New York: Barnes & Noble Books, 1997. ISBN 0-7607-0429-5. Analysis of 640 high-quality cases through 1969 by UFO legend Hynek.

Sagan, Carl & Page. Thornton, editors. UFOs: A Scientific Debate. \Cornell University Press, 1996. ISBN 0-7607-0192-2. Pro and con articles by scientists, mostly to the skeptical side.

Rose, Bill and Buttler, Tony. Flying Saucer Aircraft (Secret Projects). Leicester, UK: Midland Publishing, 2006. ISBN 1-85780-233-0.

Sturrock, Peter A. (1999). The UFO Enigma: A New Review of the Physical Evidence. New York: Warner Books. ISBN 0-446-52565-0

Canada's Unidentified Flying Objects: The Search for the Unknown , a virtual museum exhibition at Library and Archives Canada

Philip Plait (2002). Bad Astronomy: Misconceptions and Misuses Revealed, from Astrology to the Moon Landing “Hoax” . John Wiley & Sons, ISBN 0-471-40976-6. (Chapter 20: Misidentified Flying Objects: UFOs and Illusions of the Mind and Eye.)

Ian Ridpath "Astronomical Causes of UFOs"

Michael A. Seeds. (1995). Horizons: Exploring the Universe, Wadsworth Publishing, ISBN 0-534-24889-6 and ISBN 0-534-24890-X. (Appendix A)

Carl G. Jung, “Flying Saucers: A Modern Myth of Things Seen in the Skies” (translated by R.F.C. Hull); 1979, Princeton University Press, ISBN 0-691-01822-7

Richard M. Dolan, UFOs and the National Security State: An Unclassified History, Volume One: 1941–1973, 2000, Keyhole Publishing, ISBN 0-9666885-0-3. Dolan is a professional historian.

Downes, Jonathan Rising of the Moon. 2nd ed. Bangor: Xiphos, 2005.

Lawrence Fawcett & Barry J. Greenwood, The UFO Cover-Up (Originally Clear Intent), 1992, Fireside Books (Simon & Schuster), ISBN 0-671-76555-8. Many UFO documents.

Timothy Good, Above Top Secret, 1988, William Morrow & Co., ISBN 0-688-09202-0. Many UFO documents.

Kevin Randle, Project Blue Book Exposed, 1997, Marlowe & Company, ISBN 1-56924-746-3

Edward J. Ruppelt, The Report On Unidentified Flying Objects, 1956, Doubleday & Co. online. A UFO classic by insider Ruppelt, the first head of the USAF Project Blue Book

LeRoy F. Pea, Government Involvement in the UFO Coverup, or earlier title History of UFO Crash/Retrievals", 1988, PEA RESEARCH.

Paul R. Hill, Unconventional Flying Objects: a scientific analysis, 1995, Hampton Roads Publishing Co., ISBN 1-57174-027-9. Analysis of UFO technology by pioneering NACA/NASA aerospace engineer.

James M. McCampbell, Ufology: A Major Breakthrough in the Scientific Understanding of Unidentified Flying Objects, 1973, 1976, Celestial Arts, ISBN 0-89087-144-2 full-text online. Another analysis by former NASA and nuclear engineer.

James M. McCampbell, Physical effects of UFOs upon people, 1986, paper.

Antonio F. Rullán, Odors from UFOs: Deducing Odorant Chemistry and Causation from Available Data'', 2000, preliminary paper.