World out of Mind (1953)
Born Leader (1954)
     aka Worlds Apart
The Fittest (1955)
     aka The Rule of the Pagbeasts
One in 300 (1955)
When the Ship Sank (1959) (writing as James MacGregor)
200 Years to Christmas (1961)
A Cry to Heaven (1961) (writing as James MacGregor)
The Iron Rain (1962) (writing as James MacGregor)
The Million Cities (1963)
The Noman Way (1964)
Out of Chaos (1965)
Time for a Change (1967)
     aka Snow White and the Giants
Take a Pair of Private Eyes (1968)
Six Gates from Limbo (1969)
A Coat of Blackmail (1970)
Transmigration (1970)
Flight from Rebirth (1972)
The Space Sorcerers (1972)
     aka The Suiciders
The Cosmic Spies (1972)
Galactic Takeover Bid (1973)
Ruler of the World (1976)
Norman Conquest, 2066 (1977)
This is the Way the World Begins (1977)