Book 230

Critical Threshold

by Brian M Stableford

Published 15 February 1977

Book 248

Realms of Tartarus

by Brian M Stableford

Published 19 July 1977

Book 358

Paradox of the Sets

by Brian M Stableford

Published 2 October 1979

Balance of Power

by Brian M Stableford

Published 2 January 1979

Optiman

by Brian M Stableford

Published 7 October 1980