UFO Search Engine or Manuals-Search-PDF.com is a PDF search engine that caters a specific search service. It returns results of manuals that are UFO related. If you are having a hard time looking for alien related or UFO sightings ebooks using regular search engines, UFO Search Engine might be able to help you in finding what you are looking for.
The overly simple and single function search engine works like most search tools. Place the keywords and search. The results will display links where you can get/download/read the manuals, which is pretty much about it.
There’s just one thing that I noticed when I tried the search engine. When I searched for the keyword “Area 51” it returned several results about a computer brand “Alienware.” It could probably use some filters when giving search results. Since the search engine is new and all, it’s no big deal.