The Doomsday Men

2012

The Key to Irunium

2012

The Hunters of Jundagai

2012

Werewolves of Kregen (Dray Prescot, #33)

2007

Allies of Antares ( Spikatur Cycle, #4)

2007

The Steel Claw

The Vanishing Man

2006

The Suns of Scorpio (Dray Prescot, #2)

2005

Shadows over Kregen

1996

Scorpio Ablaze [Dray Prescot #41]

1992

Witches of Kregen (Witch War Cycle, #2)

1985

Seg the Bowman (Dray Prescot, #32)

1984

Talons of Scorpio (Dray Prescot, #30)

1983

The Diamond Contessa

1983

Delia of Vallia

1982

Secret Scorpio (Valian Cycle, #1)

1977

The Tides of Kregen (Dray Prescot, #12)

1976

Virility Gene

1975

Fliers of Antares (Dray Prescot, #8)

1975

Star City

1974

The Boosted Man

1974

Transit to Scorpio (Dray Prescot, #1)

1972

Roller Coaster World

1972

On the Symb Circuit

1972

Swords of the Barbarians

1970

Wizards of Senchuria

1969

Kandar

1969

To Outrun Doomsday

1967

Cycle of Nemesis

1967

Land Beyond the Map

1965

Behold the Stars

1965

Demons' World; I Want the Stars

1964

The Wizard of Starship Poseidon

1963

City Under the Sea

1957