THE MAN WHO UPSET THE UNIVERSE (FOUNDATION              AND EMPIRE) by Isaac Asimov -  1st pb, Ace Books, 1955    2ND FOUNDATION: GALACTIC EMPIRE - by Isaac Asimov      Avon Books, 1st pb, 1958                                                 Condition: Good & Good+                                                                                                                                                                  Asimov's original Foundation Trilogy was first published  in Astounding Science Fiction in the 1940s.  They didn't appear  in paperback until 1955 and 1958, and then with changed (or partially changed) titles.  UNIVERSE was one of the earliest Ace sf titles.  The spine looks rather worn and has a slight lean; the covers have some corner, & edge wear and some light creasing.  The binding is secure except for two places where the book can lie flat, and the pages are toned but otherwise ok.  2ND FOUNDATION has a cocked spine and generally modest cover/spine wear; store stamp inside, else a firm binding, a couple of small page corner creases and light page toning.