Crosstime Traffic

The Crosstime Traffic Series

First edition dust-jacket of Gunpowder Empire
Gunpowder Empire (2003) Curious Notions (2004) In High Places (2005) The Disunited States of America (2006) The Gladiator (2007) The Valley-Westside War (2008)
Author	Harry Turtledove
Country	United States
Language	English
Genre	Science fiction
Publisher	Tor Books
Published	2003-2008
Media type	Print

Crosstime Traffic is a series of books by Harry Turtledove.^[1]

The central premise of the stories is an Earth that has discovered access to alternate universes where history proceeded differently. "Crosstime Traffic" is the name of the company with a global monopoly on the technology.