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Other views: | Awards Alphabetical Chronological |
Essays
- UFOs und grüne Männchen [German] (1997)
Non-Genre Titles
Nonfiction Series
- The Bermuda Triangle
- 1 The Bermuda Triangle (1974)
- 2 Without a Trace (1977) with J. Manson Valentine
- The Mystery of Atlantis (1969)
- Mysteries from Forgotten Worlds (1972)
- Doomsday, 1999 A.D. (1981)