This Document consists of a few parts, first is an Introduction by Intelligence Department of the Brotherhood of steel, next is the “Handbook” given to vault dwellers when they first entered the vault, it is a source on general vault life, and is suitable to any campaign where contact with a vault is incurred.
Next is the History of Vault City, from the events that lead to the vault, to just after the Chosen one in Fallout 2’s visit. Like Fallout 2, references to the actual person are limited. If your playing an earlier campaign ignore those parts that occur some time after.
Then the Constitution of Vault City, while some will skip over this, and I understand why, this is a great role playing resource, allowing you to understand the Structure of Vault politics, and how they operate.
Special Characters then make an appearance, from Emerson the First First Citizen, to Lynette, the current First Citizen, and many people in between, followed by Archtypes and details on playing a citizen from any vault (with special notes for Vault City)