This quest is not available in game.
Retrieve the Moldy Tome and Tattered Manuscript for Krom Stoutarm in Ironforge.
It was lost, but there's some idea as to where it might be found.
There was only one copy ever made and it was vandalized at some point, a large portion of it ripped from the binding. Rumor has it that it somehow passed into the hands of the centaur of Thousand Needles.
The rest was lost off the coast west of Southshore, where it was to be transported to Menethil Harbor by boat. It never arrived.
In exchange for this knowledge, all I ask is that if you find it, bring it to me to see.