The Gods Unknown
- Mass Market Paperback
- New York: Berkley, 1974
New York: Berkley, 1974. 1st Printing. Mass Market Paperback. Good. 5x3x0. 1st printing. Spine lightly creased. 1974 Mass Market Paperback. 271 pp. Black-and-white photographs. A secret history of the world featuring chapters on advanced ancient civilization and the possibility of prehistoric extraterrestrial contact.