SUBTERRANEAN WORLDS: 100,000 YEARS OF DRAGONS, DWARFS, THE DEAD, LOST RACES AND UFOS FROM INSIDE THE EARTH WALTER KAFTON-MINKEL 1989
THE NIGHT MUTILATORS: THE HORRIFYING STORY OF CATTLE MUTILATIONS AND THE UFO CONNECTION GENE DUPLANTIER 1973
THE ETERNAL SUBJECT: CHARIOTS OF YESTERDAY, U.F.O’S OF TOMORROW LORD CLANCARTY BRINSLEY LE POER TRENCH 1973
SERPENTS OF FIRE: NAZI FLYING SAUCERS, THE HOLY GRAIL, AND THE HITLER/HOLLOW EARTH CONNECTION FLORIA BENTON 1983
THE FLYING SAUCERS: A REPORT ON THE FLYING SAUCERS, THEIR CREWS AND THEIR MISSION TO EARTH GEORGE KING 1964
