Science Fact article.

Novelette. Illustrated by John Schoenherr. Appeared in the anthologies [i]Analog 4[/i], edited by John W. Campbell, published in 1966; and [i]The Permanent Implosion[/i], edited by John W. Campbell, published in 1970.

Short story. Appeared in the collected works [i]Turning On[/i], published in 1966; [i]The Best of Damon Knight[/i], published in 1976; and [i]The Best of Damon Knight[/i], date unknown, under the title [i]Semper Fi[/i].

Short story. Illustrated by John Schoenherr.

Serial: part 2 of 3 parts. Illustrated by Kelly Freas.

Volume LXXIII, No. 6. 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, JohnSchoenherr; illustrators, John Schoenherr and Kelly Freas..

Volume 22, Number 6. Published by Galaxy Publishing Corporation, 421 Hudson Street, New York. Editor, Frederik Pohl; science editor, Willy Ley; associate editor, Diane Sullivan; publisher, Sol Cohen; production manager, David Perton; advertising, Dave Geller Asoc.; subscription mgr., Mavis Fisher; cover artist, Pedersen; illustrated by Gray Morrow, Jack Gaughan, Nodel and Virgil Finlay..

Complete short novel. Illustrated by Gray Morrow. Part of The Instrumentality of Mankind series.

Novelette. Illustrated by Jack Gaughan. Appeared in the anthology [i]The Ninth Galaxy Reader[/i], edited by Frederik Pohl, published in 1966.

Novelette. Illustrated by Jack Gaughan. Appeared in the anthology [i]The Ninth Galaxy Reader[/i], edited by Frederik Pohl.