Brunner, John. Sanctuary in the Sky.
Sharkey, Jack. The Secret Martians.
New York: published by Ace Books, Inc. 1960.
Small octavo, pictorial wrappers. Ace double #D-471. First printing and first paperback edition. Stress creasing and rubbing to covers and edges; creasing and rubbing to spine but not cracked; creased covers at spine, price written in pen to both covers; age tanned end pages; age tanned text pages; Good.