Ace books, 1966. Cover by Gray Morrow. Cover by Jack Gaughan.

Del Rey/Ballantine paperback, 1978. Cover by H. R. van Dongen.

Madfadden paperback, second printing, February 1968. Cover artist uncredited. "THE GREKS WERE PEOPLE-HATERS   They came to E...

Belmont SF paperback, Nov 1968. Illustration by Jack Gaughan. "There had been two attempts to blast it with atomic bombs, but i...

Tandem SF paperback, 1968. Cover artist uncredited. "Things were quiet that night in the space port. Then the 'Theban' a...

Ace paperback, 1966. Cover painting by Jack Gaughan. "Virtually the only connecting links between the innumerable colonized plan...