Contents Include; Cover-All Reflecting Schmidt Camera, Galactic Nucleus, An All Refelction Schmidet Telescope, Observing Mars in 1967, A Proposed Very Larger Telescope Array, International Satellite Geodesy, Lunar Photography,Spectrogram of Gamma Cassipeiae, Causes of the Ice Ages, Observing Saturns Edgewise Rings October 1966, Some wear that is slight, soiling of cover corners and some creasing on cover edge, Overall Good Condition!