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Essays
- UFOs und grüne Männchen [German] (1997)
Non-Genre Titles
Nonfiction Series
- The Bermuda Triangle
- 1
The Bermuda Triangle (1974)
also appeared as:
- Translation: Das Bermuda-Dreieck: Fenster zum Kosmos? [German] (1975)
- Translation: De Bermuda Driehoek [Dutch] (1975)
- 2
Without a Trace (1977)
with
J. Manson Valentine
only appeared as:
- Translation: Spoorloos in de Bermuda Driehoek [Dutch] (1977) [as by Charles Berlitz]
- Translation: Sans trace [French] (1986)
- 1
The Bermuda Triangle (1974)
also appeared as:
-
The Mystery of Atlantis (1969)
also appeared as:
- Translation: Das Atlantis-Rätsel [German] (1976)
- Translation: Het Geheim van Atlantis [Dutch] (1976)
-
Mysteries from Forgotten Worlds (1972)
also appeared as:
- Translation: Geheimen van Verzonken Beschavingen [Dutch] (1978)
- Doomsday, 1999 A.D. (1981)