Battle on Venus by William Temple, & The Silent Invaders by Robert Silverberg. A 2-in-one 1963 paperback, first printing. Two classic sci-fi adventures in one edition! Flip it over and turn it upside-down for the other story. Great early scifi. Condition: Average. Creasing on front and back covers. Spine very lightly creased. Interior yellowed, but intact and tight. One page has a small piece cut away at the bottom, and another has a section cut away across the bottom, but they do not interfere with any text. Overall condition is fair and readable.