Ace Doubles

American company Ace Books began publishing genre fiction starting in 1952. Initially these were mostly in the attractive tête-bêche format, but they also published a few single volumes, in the early years, and that number grew until the doubles stopped appearing in about 1978. The tête-bêche format was discarded in 1973, but future double novels were continued for a while.

The Ace Doubles in the database are listed below:

D-491

The Big Time / The Mind Spider And Other Stories

G-609

Contraband From Other Space / Reality Forbidden

M-141

The Brains Of Earth / The Many Worlds Of Magnus Ridolph

13783

The Dark Dimensions / Alternate Orbits