THE MULTIDIMENSIONAL GUIDE TO SCIENCE FICTION AND FANTASY OF THE TWENTIETH CENTURY, VOLUME 1 EDITED BY NAT TILANDER 2 Copyright © 2010 by Nathaniel Garret Tilander All rights reserved. No part of this book may be reproduced, stored, or transmitted by any means—whether auditory, graphic, mechanical, or electronic—without written permission of both publisher and author, except in the case of brief excerpts used in critical articles and reviews. Unauthorized reproduction of any part of this work is illegal and is punishable by law. Cover art from the novella Last Enemy by H. Beam Piper, first published in the August 1950 issue of Astounding Science Fiction, and illustrated by Miller. Image downloaded from the ―zorger.com‖ website which states that the image is licensed under a Creative Commons Public Domain License. Additional copyrighted materials incorporated in this book are as follows: Copyright © 1949-1951 by L. Sprague de Camp. 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