ACKNOWLEDGMENTS

A Martian Odyssey, by Stanley G. Weinbaum, copyright © 1934 by Continental Publications, Inc. Reprinted by permission of Forrest J. Ackerman on behalf of the author’s estate.

Twilight, by John W. Campbell, copyright © 1934 by Street & Smith Publications, Inc. Reprinted by permission of the author’s agents, Scott Meredith Literary Agency, Inc.

Helen O’Loy, by Lester del Rey, copyright © 1938 by Street & Smith Publications, Inc. Reprinted by permission of the author’s agents, Scott Meredith Literary Agency, Inc.

The Roads Must Roll, by Robert A. Heinlein, copyright © 1940 by Street & Smith Publications, Inc. Copyright renewed 1967 by Robert A. Heinlein. Reprinted by permission of the author and his agent, Lurton Blassingame.

Microcosmic God, by Theodore Sturgeon, copyright © 1941 by Street & Smith Publications, Inc. Reprinted by permission of the author and his agent, Robert P. Mills.

Nightfall, by Isaac Asimov, copyright © 1941 by Street & Smith Publications, Inc. Copyright renewed 1968 by Isaac Asimov. Reprinted by permission of the author.

The Weapon Shop, by A. E. van Vogt, copyright © 1942 by Street & Smith Publications, Inc. Reprinted by permission of the author’s agent, Forrest J. Ackerman.

Mimsy Were the Borogoves, by Lewis Padgett, copyright © 1943 by Street & Smith Publications, Inc. Reprinted by permission of Harold Matson Company, Inc.

Huddling Place, by Clifford D. Simak, copyright © 1944 by Street & Smith Publications, Inc. Reprinted by permission of the author and his agent, Robert P. Mills.

Arena, by Fredric Brown, copyright © 1944 by Street & Smith Publications, Inc. Reprinted by permission of the author’s agents, Scott Meredith Literary Agency, Inc.

First Contact, by Murray Leinster, copyright © 1945 by Street & Smith Publications, Inc. Reprinted by permission of Scott Meredith Literary Agency, Inc.

That Only a Mother, by Judith Merril, copyright © 1948 by Street & Smith Publications, Inc. Reprinted by permission of the author.

Scanners Live in Vain, by Cordwainer Smith, copyright © 1948 by Fantasy Publishing Co., Inc. Reprinted by permission of the author’s agents, Scott Meredith Literary Agency, Inc.

Mars Is Heaven!, by Ray Bradbury, copyright © 1948 by Love Romances Publishing Company, Inc. Reprinted by permission of Harold Matson Company, Inc.

The Little Black Bag, by C. M. Kornbluth, copyright © 1950 by Street & Smith Publications, Inc. Reprinted by permission of Robert P. Mills on behalf of the author’s estate.

Born of Man and Woman, by Richard Matheson, copyright © 1950 by Fantasy House, Inc. Reprinted by permission of Harold Matson Company, Inc.

Coming Attraction, by Fritz Leiber, copyright © 1950 by World Editions, Inc. Reprinted by permission of the author and his agent, Robert P. Mills.

The Quest for Saint Aquin, by Anthony Boucher, copyright © 1951 by Henry Holt & Co. Reprinted by permission of the author’s agents, Collins-Knowlton-Wing, Inc.

Surface Tension, by James Blish, copyright © 1952 by Galaxy Publishing Corporation. Reprinted by permission of the author and his agent, Robert P. Mills.

The Nine Billion Names of God, by Arthur C. Clarke, copyright © 1953 by Ballantine Books, Inc. Reprinted by permission of the author’s agents, Scott Meredith Literary Agency, Inc.

It’s a Good Life, by Jerome Bixby, copyright © 1953 by Ballantine Books, Inc. Reprinted by permission of the author’s agent, Forrest J. Ackerman.

The Cold Equations, by Tom Godwin, copyright © 1954 by Street & Smith Publications, Inc. Reprinted by permission of the author’s agents, Scott Meredith Literary Agency, Inc.

Fondly Fahrenheit, by Alfred Bester, copyright © 1954 by Fantasy House, Inc. Reprinted by permission of the author and his agent, Robert P. Mills.

The Country of the Kind, by Damon Knight, copyright © 1955 by Fantasy House, Inc. Reprinted by permission of the author and his agent, Robert P. Mills.

Flowers for Algernon, by Daniel Keyes, copyright © 1959 by Mercury Press, Inc. Reprinted by permission of the author and his agent, Robert P. Mills.

A Rose for Ecclesiastes, by Roger Zelazny, copyright © 1963 by Mercury Press, Inc. Reprinted by permission of Ace Books, Inc.