Short story. Illustrated by Leo Summers. Appeared in the collected works [i]War Games[/i] published in 2008.

Serial: Conclusion of 2 part serial. Illustrated by John Schoenherr. Published as a novel in 1976 under the title [i]Challenge the Hellmaker[/i]. Available as a free e-book on Project Gutenberg.

Volume LXXII, No. 3. Published by Conde Nast Publications, 420 Lexington Ave., New York. Editor, John W. Campbell; assistant editor, Kay Tarrant; art director, Herbert Stoltz; business manager, Robert E. Park; advertising manager, Walter J. McBride; cover artist, John Schoenherr; illustrators, John Schoenherr, George Schelling and Leo Summers.

Volume 20, Number 5. Published bi-monthly by Galaxy Publishing Corporation, 421 Hudson St., New York. Managing editor, Frederick Pohl, publisher, Robert M. Guinn; science editor, Willy Ley; art director, Sam Ruvidich cover artist, Trembath; illustrators, West, Dick Francis, Dyas, Ruvidich, Gaughan, Ivie and Mack.

Complete short novel. Illustrated by Mack.

Novelette. Illustrated by West. Featured in the anthologies [i]The Seventh Galaxy Reader[/i], edited by Frederik Pohl, published in 1964 and [i]Alpha 7[/i], edited by Robert Silverberg, published in 1977.

Novelette. Illustrated by Dyas. Virginia Blish: pen-name used by Virginia Kidd.

Short story. Illustrated by Dick Francis.

Short story. Illustrated by Ruvidich. Featured in the anthologies [i]The Eighth Galaxy Reader[/i], edited by Frederik Pohl, published in 1965 and [i]Final Encounter[/i], edited by Frederik Pohl, published in 1970.

Short story. Illustrated by Gaughan. Story also appeared under the title "Dream."