The Rival Rigelians and Planetary Agent X

THE RIVAL RIGELIANS The Galactic Commonwealth sent them to raise the backward twin planets of Rigel to a high level of civilization. The Terran team could see no difficulties, because the most advanced culture on the first planet compared to the city-states of Renaissance Italy, and the most advanced on the second paralleled the Aztecs. But no one in the Commonwealth could know that the Rigelians would teach their new masters a few tricks they didn't want to learn! PLANETARY AGENT X Ron Bronston was a space troubleshooter, a Special Agent for the United Planets Organization. His assignment - track down the homicidal maniac behind the revolts, assassinations and coup d'etats that have rocked the galaxy. This, however, was Ron's first job as an agent - and how could a green recruit succeed when dozens of the best had failed before... * The Rival Rigelians (United Planets #3) first published in 1967 by Ace Books as Ace Double #G-632 with Nebula Alert by A. Bertram Chandler. Magazine version as novella "Adaptation" published in Analog, August 1960 Planetary Agent X (United Planets #1) first published in 1965 by Ace Books as Ace Double #M-131 with Behold the Stars by Kenneth Bulmer. Originally published as two novellas: "Ultima Thule", Analog, March 196 and "H1atchetman", IImpulse June 1966.The novel is a fixup. (The statement in the book concerning the second novella as publisged in Analog under the title "Pistolero" is false.) Pagination separate: 132+ 133 Cover art by E. L. Kuam