Pre-War book (Fallout: New Vegas)

A Pre-War Book is a book that has not been destroyed. It is a fairly rare item, desired by the Capital Wasteland Brotherhood of Steel. Specifically, the Brotherhood Scribe Yearling, located within the Arlington Library, will reward you with 10 XP and 100 bottle caps per book for contributing these to their archives. See Yearning for Learning: Scribe Pre-War Books.

NOTE: Crazy Wolfgang and a few other vendors may sell a "false" Pre-War Book Once you fully invest in his inventory, Wolfgang will begin to carry them. Books that can be turned in have a value of 1, a green cover, and show a special "Book" icon, while Wolfgang's books have a value of 5, a blue cover, and appear with the "Junk" icon in your inventory.

Locations
G.E.C.K. shows that there are 111 Pre-War Books ("BookGeneric01") in the game. The links below often tell you where to find them:
 * fifteen in Alexandria Arms
 * Ten are in the Arlington Library itself (7 in the Lobby, 2 in the Children's Wing, and 72 in the Media Archives)
 * Nine can be found in the shit-holes of Minefield
 * Seven are in the Tenleytown/Friendship Station (3 in one zone, 4 in another)
 * A total of six are scattered around the National Guard Depot (1 in one zone, 2 in another, 3 in a third)
 * Six can be found in Drainage Chambers with "Signal" radio broadcasts:
 * One in Signal Alpha Lima near Broadcast Tower KB5
 * One in Signal Oscar Tango, south of the Jury Street Metro Station
 * One in Signal Oscar Zulu, southeast of Relay Tower KX-B8-11
 * One in Signal Papa November, west of the Charnel House
 * Two in Signal Sierra Romeo, north of Little Lamplight
 * Five can be found in The National Archives Basement
 * Five are in Vault 92
 * Four are in Billy Creel's house in Megaton (Must be stolen)
 * Three are in the Anchorage War Memorial
 * Three can be found in Franklin Metro Utility (2 in one zone, 1 in another)
 * Three are in Fort Constantine (2 in CO Quarters, 1 elsewhere)
 * Three can be found in the RobCo Facility
 * Two can be found in the Tepid Sewer: one in the locked storage room (opened via a terminal or Rocksalt's key) underneath some other books in a box, and one in the raider's sleeping quarters on top of the bookshelves.
 * Two can be found in the Sewer Waystation in a room in which you are attacked by a Ghoul, the books are next to the bed.
 * Two can be found in Republic of Dave in the Museum of Dave. Stealing them will result in karma loss.
 * Two can be found in Hubris Comics
 * Two are in Mama Dolce's
 * Two can be found in the east wing of L.O.B. Enterprises
 * Two are in Roosevelt Academy
 * One in a scavenger's half-destroyed house, one square West of Fort Bannister. It is on a table along with a Sawed-Off Shotgun and ammo.
 * Some can be found in an Abandoned Shack at Clifftop Shacks
 * One can be found in the Paradise Falls Slave house on a table
 * A bunch can be found on Caleb's bed in Temple of the Union
 * One can be purchased from Lydia Montenegro at Tenpenny Tower
 * One can be found in yao gui tunnels on the table by the entrance
 * One can be found in the Chryslus Building in a room above the building basement doorway.jkh

(*Note: It seems that Lydia sells pre-war books indefinitely {PC version} when stopping by at wide intervals after her stock resets. However, usually they are the "Junk" versions. )