Contents Include; Cover-Rocket Powered Airplane-D-558-2, Back Cover-Spiral Galaxy NGC 4736, The Pardonable Errors of Christopher Columbus, The Advance of Rocket Science, Four Possible Meteorite Craters in Utah, The Sextuple System of Castor, Some wear that is slight, soiling of cover corners and some creasing on cover edge, some soiling on cover, a few small creases to edges, Overall Good Condition!