Marking Time

Jacques Vallee. Dimensions: A Casebook of Alien Contact. Contemporary Books, 1988.

Technical Query

Bruce Cathie. The Pulse of the Universe: Harmonic 288. Sphere, 1981.

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Missing Pieces

Leonard G. Cramp, MSIA, ARAeS, Piece for a Jigsaw. Somerton Publishing Co., 1966.
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Losing Awareness

David Tansley. Omens of Awareness; startling parallels between UFO Phenomena and the Expanding­ Consciousness of Man. Neville Spearman, 1977.
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Weak Pulse

Trevor James Constable. The Cosmic Pulse of Life. Neville Spearman, 1977.
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Fact, Fantasy and Good Sense on UFOs

John Michael Greer. The UFO Phenomenon: Fact, Fantasy and Disinformation. Llewellyn, 2009.

Mirages

Steuart Campbell. The UFO Mystery Solved, Explicit Books, 1994.

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Getting Scientific

Jenny Randles and Peter Warrington. Science and the UFOs. Blackwell, 1985

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Out There and Not Here

Jeffrey Bennett. Beyond UFOs: The Search for Extraterrestrial Life and its Astonishing Implications for Our Future. Princeton University Press, 2008.

Surendra Verma. Why Aren't They Here: The Question of Life on Other Worlds. Icon Books, 2008.

You Couldn't Make It Up.

John Michael Greer. The UFO Phenomenon: Fact, Fantasy and Disinformation. Llewellyn, 2009

The Blame Game

Leslie G Howarth. If in Doubt, Blame the Aliens: A New Scientific Analysis of UFO Sightings, Alleged Alien Abductions, Animal Mutations and Crop Circles. Writer's Showcase, 2000.

Out of Sight

Jacques Vallée. The Invisible College, Dutton, 1975. 

Still Picking up the Pieces

Leonard G. Cramp. The Cosmic Matrix: Piece for a Jigsaw, Part Two - Antigravity, Starships and Unlimited Clean Energy. Adventures Unlimited Press, 1999.

Operation Trojan Horse

John Keel. Operation Trojan Horse. Anomalist Books, 2013. 

Electric Dreams

Albert Budden. UFOs: Psychic Close Encounters. Blandford, 1995.

UFO Theology

Charles Upton. Cracks in the Great Wall: UFOs and Traditional Metaphysics. Sophia Perrenis, 2005.

Robert Trundle. Is ET Here: No Politically but Yes Theologically and Scientifically. EcceNova, 2005.

Earthlights Revisited

Paul Devereux, Earth Lights Revelation; UFOs and mystery light form phenomena. Blandford, 1989.

Earth Lights

Paul Devereux. Earth Lights: Towards an Explanation of the UFO Enigma. Turnstone Press, 1982.

Electric UFOs

Albert Budden. Electric UFOs; Fireballs, Electromagnetics and Abnormal States. Blandford, 1998.