The following is based on Fallout 3 cut content and has not been confirmed by canon sources.
Dispatch to Scribe Yearling is a paper note in Fallout 3 which was cut from the final version of the game. It can only be obtained via console commands.
Now that Scribe Warswick has been written into the scrolls, I pass his noble task onto you.
Journey into the ruins of the city, to the once great Arlington Library. There, you will continue to collect, archive, and catalog the written works of the ancients. You will have two Paladins sent with you and you shall be requisitioned an amount of currency in order to barter and trade with Outsiders for any books that they may present to you.
Depart immediately and make haste. We cannot afford to have this work interrupted.