Ace Double D-427 To the End of Time/World of the Masterminds Classic example of the golden age of pulp science fiction, an Ace Double Novel Book. These are collectible for the art work alone. World of the Masterminds by Robert Moore Williams, flip side To the End of Time and Other Stories by Robert Moore Williams. Outstanding condition, extra fine copy, with pliable papper, and only light crease lines on spine. From my personal collection of many years, I am downsizing in retirement. Lot ID: aced427-20130605. I always combine shipping to cost based on materials and postage for weight of the lot. If you have any questions, contact me before paying Who Am I: My name is Ronald D. Edge. I live and work in Bloomington, IN, United States. I am a member of the American Philatelic Society, # 204787. I collect antique stamps, comics, and books. I am a retired computing technology and support IT director and database programming professional in real life. Having retired in Spring of 2011, I am enjoying devoting more time to stamps and other hobbies and interests.