Arlington Library

 is a mostly-intact Public Library building in Fallout 3. It is now occupied by Raiders. is easily found by following the Potomac river SE past the Citadel, then turning W to follow the road just South of the Citdael. It is directly across from Alexandria Arms and about two miles NW of the Jefferson Memorial.

Moira Brown will ask you to explore the library and download the card catalog and the library's full archives to disk as part of The Wasteland Survival Guide quest. There is also one of five Music Paper books inside that can be returned to Agatha as part of the Agatha's Song quest. Additionally, there is a special ink well inside that can be used to forge a duplicate Declaration of Independence as part of the Stealing Independence quest.

When you enter the Library you will be forced to speak with Scribe Yearling, a Capital Wasteland Brotherhood of Steel agent who is tasked with archiving all pre-war knowledge into the Brotherhood's central computers. If you do not insult her she will offer to pay you 100 Bottle caps and 10 XP per Pre-War Book given to her. She will also give you access to the Library's computer terminal, where you will be able to download the card catalog to complete Moira's quest. To complete the optional objective, you will have to explore further into the building until you find the Library's mainframe computer buried deep within a raider den. Three Brotherhood of Steel soldiers from Scribe Yearling's detachment will help you clear out the building.

Notable Loot

 * (at least)10x Pre-War Books. [Loot could possibly vary randomly. I picked up every book in the building and only got 8: 1 in the room with two turret guns, 3 in the Children's Wing room on the third floor, 2 on the catwalk overlooking the main library, 1 in the booby-trapped room.]
 * 1x Sheet Music Book - in the classroom atop a children's school desk immediately to the right as you enter the room; may also be located in a office/cubicle area in the children's area on the first floor, near a metal music stand. [Couldn't find this in either place.]
 * 1x Quest Item: Ink Well in 'restoration' box in the Media section.
 * 5x Skill Books - Big Book of Science (first floor office to the right). Guns and Bullets (technically in children's side, but is only accessible through a door on the Media side on the top floor). You'll also find 3 of the above mentioned Pre-War books here, along with a shotgun and some ammo. Tumblers Today (on desk in room where you download the archives). Lying, Congressional Style (Children's Wing, it's on a shelf in a break room). There is a copy of Tales of a Junktown Jerky Vendor, which can be found in the room with the pool table in the Media Archive.
 * 2x Nuka-Cola Quantum - on the SW corner of the room where you download the archives; the other one is in the children's section at the bottom floor inside a Nuka-Cola machine. [Couldn't find this second one. In fact, could not find a "children's section" on the bottom floor, and elsewhere online someone listed from the "official guide" and the library only had one.]
 * At least 2x Holotags from fallen Brotherhood Of Steel guys.
 * 2x Stealth Boys - one on table in area overlooking the lobby; one in an ammo box in the lobby.

Appearances
 only appears in Fallout 3.