United Launch Alliance - Wikipedia
ULA Vulcan Launch Vehicle (as announced/built) - General
Vulcan Centaur, Wiki
Discuss] ULA's Vulcan Centaur rocket - collectSPACE: Messages
Launch Company United Launch Alliance (ULA)
Centaur, Myth and Folklore Wiki
First Vulcan launch further delayed for Centaur modifications
ULA announces May launch of first Vulcan - SpaceNews
First Vulcan launch further delayed for Centaur modifications
Vulcan Heavy! “By demand of the Internet, here is the uncropped
How To Build ULA Vulcan Centaur Rocket : Spaceflight Simulator
Unlikely Bedfellows: Concept of Starship carrying a Centaur III
ULA's New Rocket - Vulcan Centaur