Ace Double (G-614, 50 cents) 1967 paperback. Condition is VG to VG+: tight and square, spine has slight dish; light overall wear including wear to ends of spine; age tannning is mild and uniform. No stamps, marks or writing.

Ace Double G-614 (1967): Shock Wave, bound with Envoy to the Dog Star.

Shock Wave by Walt & Leigh Richmond (Cover by Hoot von Zitzenwitz, 127 pages)
Problem 1: An Earthman is suddenly an mysteriously transported to an alien planet: an utterly empty, completely lifeless outpost of a far-flung galaxy. Terry Ferman has no idea where he is, how he came to be on the godforsaken world, or how to get home. Problem 2: For company there is only a computer - one which has all the answers to all of his questions. But the computer is programmed to give information only to those properly trained and qualified to understand it - Terry is not. Solution: Terry must outwit the rigid electro-mechanical being to learn the secrets that will get him back to Earth... but the solution is the biggest problem of them all.

I rather liked this when I first encountered it 3 decades ago, and recommend it - along with most other books by the Richmonds.

(bound with) Envoy to the Dog Star, by Frederick L. Shaw, Jr. (Cover by Birmingham, 2 frontispieces by Jack Gaughan; 127 pages.) For the first flight to a distant star, a dog was sent to do the job instead of risking a man - one bred just for that purpose. A dog that was raised biogenetically to the intellegence level of a human, able to think, to communicate, to transmit back what people wanted to know about the planets circling Sirius. But a dog trained to think for itself may also start to think for its own best interests...