Vintage Paperback Book, "These Savage Futurians", Philip E. High, "The Double Invaders", John Rackham, 1967, paperback original (PBO), cover art by Gray Morrow. Ace Double #G-623. Grades GD. Some cover wear, some corner and edge wear, some creasing, some spine wear, some moisture damage to cover and about one third of the pages, pages only lightly discolored. Good reader copy.