The best (and most accurate) nonfiction UFO book ever written is Revelation X.
All Hail Bob!
Give me Slack or Give me Death!
A really useful one, if you can find a copy, is The UFO Handbook by Allan Hendry. Intended as an investigator’s guide, it’s unique, to my knowledge, in that it gives detailed descriptions of the many types of IFO (identifiable flying objects) and the methods for recognizing them. It also uses “unidentified” to mean precisely that, nothing more, and is refreshingly calm and agnostic on the whole “aliens!!!” issue. There’s no snarking at people who report UFOs, not even those who mistake blowing trash for flying saucers–they’re mistaken, that’s all. And it gives advice on what to do if you see a UFO, including the useful tip: “Get additional witnesses–even if you have to scream for them.”
Visitors from Time by Marc Davenport. I first read that back in the 90s and it has some interesting theories that have stuck with me over the years.
New book out Summer of 2011
“My Lying Eyes” Barnes and Nobles
By: Sheryl Trimble
I pre-read for this book. Best eye opening book to date. A must see! Sure to be on the top UFO reads.
Gray Highway. It’s a humorous nonfiction UFO roadtrip book. (Written by some chuckleheads who I won’t mention.)
I’ll chime in too with Communion. Very engaging and spooky book. Streiber’s interpretation of the events is debatable, but it’s clearly a truthful account of what he felt he experienced.