Serial: part 1 of 2 parts. Illustrated by Schoenherr. Part of the Cities in Flight seires. Published as a novel in 1962 under the same title.

Novelette. Illustrated by Brotman. Published as a book by Aegypan in 2003 under the same title. Available as a free ebook on Project Gutenberg.

Short story. Illustrated by Douglas. Appeared in the collected works [i]The Best of Mack Reynolds[/i], published in 1976 and [i]Compounded Interests[/i], published in 1983. Appeared in the anthologies [i]Analog 2[/i], edited by John W. Campbell, Jr., published in 1964 and [i]Analog Anthology[/i], edited by John W. Campbell, Jr., published in 1965.

Short story. Illustratred by Schoenherr. Part of the Patent Office Series. Leonard Lockhard: pen-name used by Theodore L. Thomas Charles Leonard Harness. Text available as a free ebook on Project Gutenberg. Available as an audio book on LibriVox.

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

Short story. Available as an ebook on Project Gutenberg. Available as an audio book on LibriVox:.

Article.

Volume LXX, No. 1. 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, Solonevich; illustrators, Schoenherr, Brotman, Douglas and Brev.

Volume LXX, No. 1. 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, Solonevich; illustrators, Schoenherr, Brotman, Douglas and Brev.