Contents Include; Cover-Photo of Planet Jupiter, Back Cover-Double Cluster in PErseus H and Chi Persie Photographed with 36 Inch Crossley Reflector, The NSF and Astronomy, How to Estimate the Brightness of a Star, Messier and His Catalouge Part II, Galatic Star Clusters, 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!