Experience the end of the world as we know it in two classic novels from "one of science fiction's most revered writers" (USA Today).   Now in one volume: two post-apocalyptic adventures from the visionary mind of Grand Master of Science Fiction and Hugo and Nebula Award-winning author Poul Anderson.   The Winter of the World   A second Ice Age has destroyed civilization. From its ruins arises the powerful Rahidi empire, bent on seeking world domination and leaving devastation in its wake. But its invasion of the primitive Rogaviki may not go as planned, for at the head of their forces is the indomitable Donya of Hervar, a woman of courage and conviction who will not let her people perish without a fight . . .   "An intriguing mystery about the Rogaviki people . . . Quite a worthwhile read. Certainly [Anderson] put a lot of thought into this novel and he's achieved something worthwhile and exhilarating." --SFReviews.net   Twilight World   After the nuclear holocaust of World War III, humanity has to rebuild in the midst of famine, savagery, and chaos. Residual radiation has resulted in an increasing rate of mutant births. But as the human race faces its own extinction, some of the so-called abnormal children may have just what it takes to survive . . .   Praise for Science Fiction Grand Master Poul Anderson   "Anderson has produced more milestones in contemporary science fiction and fantasy than any one man is entitled to." --Stephen Donaldson   "The great canvas of interstellar space comes alive under Anderson's hand as it does under no other." --Gordon R. Dickson   "One of science fiction's most influential and prolific writers." --The Daily Telegraph