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The UFO encyclopedia
Jerome Clark
The UFO encyclopedia
Margaret Sachs
The UFO Magazine UFO Encyclopedia
William J. Birnes
The UFO encyclopedia
John Spencer
The UFO Encyclopedia, 3rd Ed.
Jerome Clark
The UFO encyclopedia
John Spencer
The UFO Encyclopedia
Compiled and Edited By John Spencer
The UFO Encyclopedia, 4th Ed.
Jerome Clark
Encyclopedia Brown and the case of the secret UFOs
Donald J. Sobol
The UFO book
Jerome Clark
The Encyclopedia of UFOs
Ronald Story
The encyclopedia of the paranormal
Gordon Stein
The Encyclopedia of UFOs
Ronald Story
Ufo
David Ritchie
The little giant encyclopedia of UFOs
The Diagram Group
Conspiracy encyclopedia
Richard Belfield
The New UFO Encyclopedia
John Spencer
The Encyclopedic Sourcebook of UFO Religions
James R. Lewis
Encyclopedia of UFO in Black Sea : Facts, Figures and Truth about the UFOs and Related Phenomena
Oralee Orgill
Encyclopedia of Fundamentalism
Brenda Brasher