Ufos: Are Alien Aircraft Overhead?

UFOs: Are Alien Aircraft Overhead? Readers will examine the history of UFOs, Roswell, alien abduction, Area 51 and more before deciding for themselves Table of contents, fun facts, a glossary, and an index are included. Aligned to Common Core Standards and correlated to state standards. Checkerboard Library is an imprint of Abdo Publishing, a division of ABDO.