In the introduction, Harmon reflected on the novel's history: This is a period piece, written during the last years of the pulp era.

One reason (but only one) was that in those days novels were accepted almost exclusively by the leaders in the field like Robert Heinlein, Isaac Asimov and Theodore Sturgeon, by both magazines and paperback and hardcover publishers.

Somehow, I decided to keep this novel “a little while longer.” Finally, I encountered Fender Tucker and his wonderful endeavor, Ramble House, and got a go-ahead to put out The Contested Earth.

His first mainstream book on the subject was The Great Radio Heroes (Doubleday, 1967; revised edition by McFarland & Company, 2002).

Chapters cover the stars of cop shows, Westerns, comedies, adventures, and dramas.

He edited volumes two and three of It's That Time Again (Bearmanor Media, 2004 and 2006), an anthology series of new fiction featuring the characters of old-time radio.

For the second book in the series, he contributed "Sherlock Holmes and the Adventure of the Duplicate Daughter" and "The Avenger and the Maker of Werewolves."

Harmon was the Guest of Honor at the Multicon 70 science-fiction convention, held in Oklahoma City in June 1970, and a 1977 recipient of the Inkpot Award, given annually at San Diego Comic-Con.