Ace Double (G-632, 50 cent cover price) 1967 paperback. Condition is Fine: very tight and very square with flat spine; no age tanning (much, much less than expected for its age) - edges are "sharp" / pages are bright. No stamps, marks or writing - a very clean copy that looks new. [I see a tiny (1/16") flaw at right near bottom of the Chandler side, but given the exceptional quality of the rest, consider it to be of little or no importance.]

Ace Double G-632 (1967), containing Nebula Alert by A. Bertram Chandler, bound with The Rival Rigelians by Mack Reynolds.

Nebula Alert, by A. Bertram Chandler (cover by Kelly Freas, frontispiece by Jack Gaughan, 121 pages) - The converted light cruiser Wanderer was captained by Trafford and owned by his wife, Irene, who was Empress-Elect of the Federation. From Mr. Smith of the Galactic League for the Abolition and Suppression of Slavery, they had a commission to take a cargo of Iralians home. Iralians were humaniod and technically free citizens of the Galactic Empire, but prized by slavers because they had the unique capacity to transmit acquired knowledge by heredity. So the crew of the Wanderer expected to be hunted by interstellar slavers for the priceless passengers they bore. But they weren't expecting the Iralians to have mutiny and high treason in mind. And when pursued, they passed too close to the Horsehead Nebula, which tended to warp time, space and dimensions - throwing them and their pursuers into another universe. They are promptly hailed by the ship Faraway Quest, bearing Commodore John Grimes and Sonya Verrill.

The Rival Rigelians by Mack Reynolds (cover by Peter Michael, frontispiece by Jack Gaughan, 132 pages) - This is expanded from "Adaptation" in Astounding in 1960. 2 planets of the Rigel system (Texcoco and Genoa) are to be industrialized so they can be part of the Galactic Commonwealth. The co-leaders of the expedition choose capitalism and communism as their cultural models - but the locals have their own ideas.