During the Clone Wars the nebula was considered a vital (though isolated) supply route, and the Galactic Republic fought against the Confederate-aligned Umbaran militia for control of their homeworld. After the creation of the Galactic Empire, the Atoan system was conquered after a failed rebellion led by the traitorous Garoche Tarkin and local insurgents.
- Star Wars: Attack of the Clones: The Visual Dictionary
- Ultimate Alien Anthology
- Star Wars: Revenge of the Sith: The Visual Dictionary
- Star Wars: The Complete Visual Dictionary
- The New Essential Guide to Alien Species
- "Strangers Among Us: The Aliens Who Built the Galactic Empire" — Star Wars Insider 96
- The Essential Atlas
- Galaxy of Intrigue