ProgrammingAce, the admin of the Game of the Art website that collects various game concept art and design docs, got hold of the design document for the canceled Fallout: Brotherhood of Steel 2 (also known as Vagrant Lands), a sequel to the unsuccessful Fallout: Brotherhood of Steel. The development started before the release of the first game, and it was canceled soon after because of the first title's poor sales.
The design document for the game was written by Brian Freyermuth (one of the designers of the original Fallout). The plot incorporated some elements from Van Buren, the canceled Fallout 3 by Black Isle Studios (Caesar's Legion, the Jackals, Nursery), as well as the mutated G.E.C.K. from the canceled Fallout Tactics 2.
You can download the document here.