Ace Double No. M-123 (July 1965), first book publication for both stories. Spine, covers fairly creased, minor edge wear except spine shows somewhat more wear. Store stamp and price inside both covers, Some yellowing but text is clean and unmarked.
"The Altar on Asconel" - "He remembered the day ten years ago when his older brother had been made a Warden of Asconel, a prosperous and happy planet, and he and his other brothers had left in the interests of their people. Now they had returned to a world where a fanatical cult had usurped the Warden's chair, and men and women were gladly offering themselves up as human sacrifices to Belizuek-whoever or whatever that being from beyond the galaxy was."
"Android Avenger" - "Born of man and machine, to whom did he owe his loyalty? "My body turned into an office building and raced down the corridor to a room where a man was sitting at a console. He'd begun to swing around in his chair when my mouth opened, and a thin, blood-red ray shot out, cleaving the man from head to abdomen. Then it was over. My mouth closed, and I stood there, stunned. Up to today I was Bob Tanner, an average, sane Citizen. Now what was I, man or murder machine?"; 5¾" - 6¾" Tall