- In Search of the Unknown (1946)
Popular science and pseudoscience
- For the Record:
- Between Two Worlds (1933)
- On the Edge of the Future (1950)
- The Man from Mars (1953)
- Scientific Mysteries:
- What You Should Know About ESP (1955)
- The Haunted Mind (1959)
- The Unfinished Casebook of Dr. Hudson Hoagland (1969)
- Other Popular Science and Pseudoscience Works:
- New Paths in Psychical Research (1936)
- The Story of ESP (1949)
- Superman: Symbol of the Eternal Quest (1978)
- Mind Over Space (1981)
- The Last Message of Jesus Revealed (1989)