THE EXPANDING CASE FOR THE UFO
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MIB: A REPORT ON THE MYSTERIOUS MEN IN BLACK WHO HAVE TERRORIZED UFO WITNESSES AND INVESTIGATORS IN ALL PARTS OF THE NATION
- RICK R. HILBERG, ROBERT S. EASLEY
- 1968

UFOS AND RELATED SUBJECTS: AN ANNOTATED BIBLIOGRAPHY
- DEFENSE TECHNICAL INFORMATION CENTER, LIBRARY OF CONGRESS, LYNN E. CATOE
- 1969

THE NEPHILIM: REALITY OR FICTION? … ARE THEY THE SEEDS OF UFO OR FALLEN ANGELS? …
- ODETTE BOILY
- 2011

MESSENGERS OF DECEPTION: UFO CONTACTS AND CULTS
- JACQUES VALLÉE
- 1979

THE NIGHT MUTILATORS: THE HORRIFYING STORY OF CATTLE MUTILATIONS AND THE UFO CONNECTION
- GENE DUPLANTIER
- 1973

UFO REVIEW NO. 32 “ALIEN/CIA CONNECTION”
- WILLIAM COOPER

WHY UFOS: OPERATION TROJAN HORSE
- JOHN ALVA KEEL
- 1970

FLYING SAUCER FROM MARS;
- CEDRIC ALLINGHAM
- 1954

CIA’S ROLE IN THE STUDY OF UFOS, 1947–90
- GERALD K. HAINES, STUDIES IN INTELLIGENCE
- 1997