An Ace Double from 1969, containing The Rim Gods, by A. Bertram Chandler, bound with The High Hex by Laurence M. Janifer & S. J. Treibich.

The Rim Gods by A. Bertram Chandler - (142 pages, cover by John Schoenherr.) A fix-up of 4 "Rim" novelets featuring Commodore John Grimes - all appeared in If in 1968:

The Rim Gods
The Bird-Brained Navigator
The Tin Fishes
The Last Dreamer

(bound with) The High Hex by Laurence M. Janifer & S. J. Treibich - (cover by Kelly Freas, 112 pages.) Sequel to Target: Terra (1968). Second of 3 in the "Angelo di Stefano" series (followed by The Wagered World.)