Task: Text Categorization
Input (English): Text:  The Flying Saucers Are Real by Donald Keyhoe is a book that investigates numerous encounters between USAF fighters personnel and other aircraft and UFOs between 1947 and 1950. It was printed in paperback by Fawcett Publications Inc.Keyhoe contended that the Air Force was actively investigating these cases of close encounter with a policy of concealing their existence from the public until 1949.
Output (English): No