Title: The Time Traders (Time Traders Series #1), Author: Andre Norton
Title: Time Traders Omnibus: The Time Traders / The Defiant Agents / Key Out of Time, Author: Andre Norton
Title: The Time Traders: Book One of Time Traders Series, Author: Andre Norton
Title: Time Traders II: The Defiant Agents and Key Out of Time, Author: Andre Norton
Title: The Defiant Agents (Time Traders Series #3), Author: Andre Norton
Title: Key Out of Time (Time Traders Series #4), Author: Andre Norton
Title: Echoes in Time, Author: Andre Norton
Title: The Time Traders Omnibus Collection - Includes The Time Traders, Galactic Derelict, The Defiant Agents, Key Out of Time (Formatted & Optimized for Nook), Author: Andre Norton
Title: Galactic Derelict, Author: Andre Norton
Title: Atlantis Endgame, Author: Andre Norton