Space Mercenaries & The Caves of Mars by E.Petaja & A.Chandler
1965. No Edition Remarks. 256 pages. Illustrated paper cover. Ace double book. Second story from the other side of textblock. Clean pages with noticeable tanning and foxing throughout. Textblock edges dyed yellow. Binding remains firm. Paper covers have moderate edge-wear with slight rubbing to surfaces and curling to corners. Visible wear marks to spine and covers.