This book is basically a collection of random UFO stories pulled from old newsletters, magazines, and even the National Enquirer (!?!). It doesn't seem like the author did any original research—just repeated what had already been published.
On top of that, several chapters talk about ghosts, poltergeists, and other supernatural stuff that has nothing to do with UFOs, making the book feel all over the place.
It’s a hot mess likely thrown together in a week or two to capitalize on the ‘hot topic’ of alien visitations that was so hyped up in the 70’s.
In fact, nostalgia for that era is really the only reason I read it.