Harry Turtledove
210 books • 38 series
American Empire
Book #3: Victorious Opposition
Atlantis
The Colonisation
Book #2: Colonisation: Down to Earth
Book #3: Aftershocks
Colonization
Book #1: Second Contact
Book #1: Colonization: Second Contact
Book #2: Down to Earth
Book #2: Down to Earth
Book #3: Aftershocks
Conan
Book #43: Conan of Venarium
Crosstime Traffic
Book #2: Curious Notions
Book #3: In High Places
Book #4: The Disunited States of America
Book #5: The Gladiator
Book #6: The Valley-Westside War
Darkness
Book #3: Through the Darkness
Book #4: Rulers of the Darkness
Darkness (Tor Books)
Days of Infamy
Book #1: Days of Infamy
Book #2: End of the Beginning
Gerin the Fox
Book #1: Werenight
Book #2: Prince of the North
The Great War
Book #1: Great War
Book #3: Walk in Hell
Book #3: Breakthroughs
Book #3: The Great War: Breakthroughs
Hot War
Opening of the World
Pearl Harbor
Book #2: End of the Beginning
Scepter of Mercy
Book #1: The Bastard King
Book #1: The Bastard King
Book #2: The Chernagor Pirates
Book #2: The Chernagor Pirates
Settling Accounts Trilogy
Book #1: Return Engagement
Book #2: Settling Accounts: Drive to the East
Book #2: Drive to the East
Book #3: The Grapple
Book #4: In at the Death
Southern Victory
Book #2: How Few Remain
Southern Victory: American Empire
Southern Victory: Settling Accounts
Book #1: Return Engagement
Book #2: Settling Accounts: Drive to the East
Book #3: The Grapple
Book #4: In at the Death