Those Who Watch
Robert Silverberg
1967

The Truth About Flying Saucers
Aime Michel
1967

UFO
Earl J. Neff
1967

The UFO Report
Irving A. Greenfield
1967

UFO: Top Secret
Mort Young
1967

UFOs for The Millions
Howard V. Chambers
1967

Uninvited Visitors
Ivan T. Sanderson
1967

War of the Worlds
H.G. Wells
1967

The Warminster Mystery
Arthur Shuttlewood
1967

Why Are They Watching Us?
Allen Louis Erskine
1967

Alien From the Stars
R.L. Fanthorpe
1968

The Allende Letters
Brad Steiger and Joan Whritenour
1968

Anthropol
Louis Trimble
1968

Are The Invaders Coming?
Steven Tyler
1968

The Earth Is Mine
Luther Cox
1968

Escape Across the Cosmos
Gardner Fox
1968

Flying Saucer Classics
Alan J. Manak ed.
1968

Flying Saucer Report: UFOs Unidentified Undeniable
Roger H. Stanway & Anthony R Pace
1968

Flying Saucers
Editors of Cowles & UPI
1968

The German Saucer Story
Michael X. Barton
1968

Identified Flying Saucers
Robert Loftin
1968

The Intelligent Man's Guide to Flying Saucers
T.M. Wright
1968

The Invaders - The Meteor Men
Anthony Lebaron
1968

Is Something Up There?
Dale White
1968

Is There Life on Other Worlds?
Poul Anderson
1968

Mysteries of the Skies
Gordon I. R. Lore, Jr. & Harold H. Deneault, Jr.
1968

Mysterious Fires and Lights
Vincent H. Gaddis
1968

The Official Guide To UFOs
Dick Demske, ed.
1968

The Official Guide to UFOs
Editors of Science & Mechanics
1968

Round Trip Space Ship
Louis Slobodkin
1968

Seven Sexes
William Tenn
1968

Sideslip
Ted White and Dave Van Arnam
1968

Space Ghost, [The Sorceress of Cyba 3]
Don R. Christensen
1968

Studies of Flying Saucers
Thornton Page, Class Professor
1968

UFO - Ho Ho!
Joseph Farris
1968

UFO Ho-Ho
Joseph Farris
1968