Ace Double (H-40, 60 cent cover price) 1968 paperback. Condition is only Fair to Good: tight and almost square; spine is slightly dished with a few lines, edgewear, and endwear. The Tubb half has a 3" fold mark (mild crease) at upper right; moderate to heavy wear, including 1/4" top strip gone at upper left of Tubb side; Rackham side has 1/2" top-strip gone from lower left corner, faint scratches in middle, and what appears to be a bite mark at bottom right. Age tanning is mild and uniform. Stamps on first pages & page 85 - from the reserves of a defunct SF library - no other marks or writing.

Ace Double H-40 (1968) - containing Alien Sea by "John Rackham" (real name is John T. Phillifent), bound with C. O. D. Mars by E. C. Tubb.

Alien Sea by John Rackham. (Cover by Georg Ziel, frontispiece by Jack Gaughan; 154 pages.) Dennis Dillard was a dramatape recorder, visiting the water-planet Hydro. There he stumbles into a possible alliance between Venusians and the alien Roggans- which may plunge Earth into war.

(Bound with) C. O. D. Mars, by E. C. Tubb. (Cover and frontispiece by Jack Gaughan; 99 pages.) The Scorfu - the Martian equivalent of a Mafia - wanted to know why the Earth Government had put the newly returned explorers from Proxima Centauri into permanent orbital isolation. They offered a fearless operative, Martin Slade, a million to produce these explorers: Cash On Delivery, Mars.