In May 1970, OPERATION TROJAN HORSE by John Keel was published by Putnam. While other authors of the day were trying to focus their attentions on UFO sightings in the skies, Keel alone widened his scope of investigation to include other unexplained phenomena in the American culture. Soon the others quickly began aping Keel's research.
"All over the world, hack writers sharpened their pencils, though, and stole from OTH as if the copyright laws did not exist. It became one of the most quoted and most plagiarized books in the field.", Keel wrote of his fellow colleagues.
So the question you might be asking yourself is: if this book is so important why didn't I hear of it? Well you can blame its rarity on Putnam publishing. In the early seventies the company decided to scale down it's UFO \ Occult division and focused more on adventure yarns and romance stories. So while Bantam was reprinting CHARIOTS OF THE GODS for the sixth time, OTH found it's way to the shelves of used book stores quickly to be snatched up by serious UFO researchers.
So what makes Keel's book so interesting? If I must sum it up to one thing it must be Keel's radical approach to viewing the unexplained such as UFOs, poltergeists, angels, and lake monsters as ultradimensional rather than extraterrestrial in origin. In other words, they're not from outer space but exist all around us - vibrating at different frequencies. And sometimes they cross over, or become part of our dimension.
Sometimes these occurrences became explained by the culture at the time as supernatural in origin. Here's an example: "Demonology is not just another crackpot-ology ... The manifestations and occurrences described in this imposing literature are similar, if not entirely identical, to the UFO phenomenon itself. Victims of demonomania (possession) suffer the very same medical and emotional symptoms as the UFO contactee." Keel also makes the same case for flying wheels and angels in the bible, voodoo, spiritualism, hauntings, and the occasional visit from a "man in black".
I would be remiss in my responsibilities as a book reviewer to insist that a UFO/Paranormal researcher should purchase a copy of John Keel's OPERATION TROJAN HORSE. The truth is that you should buy three copies; one for your personal library, the second to highlight, and the third to keep for the ages!