EMPIRE OF THE ATOM by A. E. Van Vogt - 1st Ace Ed. & SPACE STATION #1 by Frank Belknap Long - 1st Ed., 1957        Condition: Near Very Good                                                        EARTH'S LAST FORTRESS by A. E. Van Vogt - 1st Book             Publication & LOST IN SPACE by George O. Smith - 1st           Paperback Ed. - Condition: Good+                                           All published by Ace Books                                                                                                                                                                    Ace D-242 (EMPIRE  & STATION) has some spine end wear, inc. a short tear, a small stain across top page edges; else, only light wear.  Ace D-431 (EARTH'S & LOST) has spine end wear, inc. short tears, light reading crease & some cover corner wear.  Pages are toned.  No writing or markings in either book and bindings are secure.