The Ufo Encyclopedia

Pocket Books

The UFO Magazine UFO Encyclopedia: The Most Compreshensive Single-Volume UFO Reference in Print

Relevant Information, LLC

The UFO Encyclopedia, 4th Ed. Volume 2: N-Z      

The UFO Encyclopedia, 3rd Ed. (English Edition)  

Headline Book Publishing

UFO Encyclopedia                                

Putnam Pub Group

The Ufo Encyclopedia                            

Relevant Information, LLC

The UFO Encyclopedia, 4th Ed. Volume 1: A-M      

Headline Book Publishing

The New UFO Encyclopedia                        

Omnigraphics Inc

UFO Encyclopedia 2nd                            

Independently published

The Art Of Aliens & UFO Encyclopedia: Historical Encounters And Sightings Art Book With Short Stories

Omnigraphics Inc

Ufos in the 1980s (UFO ENCYCLOPEDIA)