Past Imperfect - Daw Book Collectors Author:Martin H. Greenberg (Editor), Larry Segriff (Editor) Some of the most forward-thinking science fiction writers of our time take on the neverending paradoxes of time travel in this original anthology of all-new tales by Kristine Kathryn Rusch, Peter Crowther, Jane Lindskold, Robin Wayne Bailey, Gary Braunbeck, Dean Wesley Smith, Jody Lynn Nye, James P. Hogan, and others.