• Ruined Tome
• Item Level 1Disenchants into:
  Not disenchantable
• "An old, worthless tome."

Source

Musty Tome in Western Plaguelands.

Notes

As the comments state, this book is truly worthless, as it can't even be sold to vendors.

External links

• Battle.net (EU)
• Wowhead
• Thottbot
• WoWDB