ACE DOUBLE: DAWNMAN PLANET / INHERIT THE EARTH

Ace books, 1967. Cover by Jack Gaughan.

Cover by Ted Hanke.

ACE DOUBLE: SPACE CAPTAIN / THE MAD METROPOLIS

Ace books, 1966. Cover by Gray Morrow.

Cover by Jack Gaughan.

ACE DOUBLE: BOW DOWN TO NUL / THE DARK DESTROYERS

Ace Books, 1960. Cover by Ed Emshwiller.

Cover by Ed Valigursky.

ACE DOUBLE: COLLISION COURSE / THE NEMESIS FROM TERRA

Ace books, 1961. Cover by Ed Valigursky.

Cover by Ed Emshwiller.

GLADIATOR-AT-LAW

Ballantine Books, 1955. Cover by Richard Powers.

Rear cover.

THE MIND FROM OUTER SPACE

Curtis Books, 1972. Cover artist is uncredited.

THE ESCAPE ORBIT

Ace books, 1965. Cover by Jack Gaughan.

DREAM LORDS / LORD OF NIGHTMARES

Zebra Books, 1975. Cover artist is uncredited.

ALTERNATING CURRENTS

Ballantine paperback, 1956. Cover by Richard M. Powers.

TILTANGLE

Ballantine paperback, 1970. Cover artwork by John Berkey.

PARADOX LOST

Berkley Medallion paperback, 1974. Cover artwork by Vincent Di Fate.

MARUNE: ALASTOR 933

DAW paperback, 1981. Cover artwork by David Mattingly.

MYTH-MASTER

Dell paperback, 1973. Cover artwork by Robert R. Foster.

CEMETERY WORLD

Berkley Medallion paperback, 1974. Cover artwork by Vincent Di Fate.

MIRROR IMAGE

DAW paperback, 1972. Cover artwork by Kelly Freas.