Recovered Tome

Recovered Tomes dropped from the following ogres in Alterac Mountains:
 * Crushridge Brute
 * Crushridge Enforcer
 * Crushridge Ogre
 * Crushridge Plunderer
 * Crushridge Mage
 * Crushridge Warmonger
 * Crushridge Mauler

As a quest objective

 * Preserving Knowledge