Short story. Illustrated by John Giunta. Appeared in the collected work [i]Danger-Human[/i], published in 1970; [i]The Book of Gordon Dickson[/i], published in 1973; and [i]The Man from Earth[/i], publshed in 1983.

Short story.

Short story. Illustrated by Nodel. Appeared in the collected works [i]Two Tales and Eight Tomorrows[/i], published in 1965 under the title [i]Unto My Manifold Dooms.[/i]

Short story.

Science Department article.

Volume 22, Number 5. Published by Galaxy Publishing Corporation, 421 Hudson Street, New York. Editor, Frederik Pohl; science editor, Willy Ley; publisher, Sol Cohen; production manager, David Perton; advertising, Dave Geller Asoc.; subscription mgr., Mavis Fisher; cover artist, McKenna; illustrated by Morrow, John Giunta, Jack Gaughan, Nodel and Cowles.

Volume LXXIII, No. 5. Published by Conde Nast Publications, Inc., 420 Lexington Ave., New York. Editor, John W. Campbell; asistant editor, Kay Tarrant; art director, Herbert S. Stoltz; business manager, Robert E. Park; advertising director, Harry F. Decker, advertising manager, Walter J. McBride; cover artist, Kelly Freas; illustrators, Kelly Freas and John Schoenherr..

Science fact article.

Serial: part 1 of 3 parts. Illustrated by Kelly Freas. Published as a novel in 1965 under the same title.

Novelette. Illustrated by John Schoenherr. Nicholas Van Rijn series. Appeared in the collected works [i]Trader to the Stars[/i], published in 1964; [i]Going for Infinity[/i], published in 2002; and [i]David Falkayn: Star Trader[/i], published in 2009. Appeared in the anthology [i]Robert Silverberg Presents the Great SF Stories: 1964[/i], edited by Robert Silverberg and Martin H. Greenberg, published in 2002.