“Alien Investigations” explores UFO sightings, landings, crashes, aliens, and, admittedly, some hoaxes, based on interviews and photographs.  Beginning with the first UFO report filed with the U.S. military in 1947 near Mineral, Washington, the book is organized by spacecraft shape, landings, alien types, and hoaxes.  Some cases in other countries are included, but most were reports from the U.S. The illustrations were a down-side for me.  Drawings of spacecraft and the whimsical alien cartoon characters don’t give credibility to the topic.