This is a beautiful souvenir sheet consisting of 1 stamp, issued by Guinea in 2006, featuring the crew from the NASA Space Shuttle Columbia mission STS-107, including Rick D. Husband, William C. McCool, David M. Brown, Kalpana Chawla, Michael P. Anderson, Laurel B. Clark, and Ilan Ramon. Also displayed are images of installations of future lunar bases, and images of future missions of Mars. The sheet is Post Office fresh, mint never hinged.