The Ark Chronicles:
People of the Ark
People of the Flood
People of Babel
People of the Tower
Lost Civilizations:
Giants
Leviathan
The Tree of Life
Gog
Behemoth
The Lod Saga
The Oracle of Gog
The Doom Star Series:
Star Soldier
Bio-Weapon
Battle Pod
Cyborg Assault
Planet Wrecker
Star Fortress
Alternate Europe:
The Dragon Horn
Dark Crusade
Assassin of the Damned
Historical Novels:
The Great Pagan Army
The Sword of Carthage
The Rogue Knight
Other Novels:
Invasion: Alaska
Strontium-90
The Dragon of Carthage
Accelerated