The best explanation for UFO phenomena that I've come across.
Discussion
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Not read this.
I quite like Jacques Vallee
This https://www.goodreads.com/book/show/406344.Passport_to_Magonia
And
https://www.goodreads.com/en/book/show/406348
Sounds like there may be some overlap. Although Vallee is definitely a lot more ambiguous. He's an interesting character, was around for the invention of arpanet. The French scientist in Close Encounters was based on him.
Second time this book has entered my awareness. I will read it