The Literacy Campaign quest for requires you to give a copy of The Annotated Anuad to Vala Catraso in the school in the Ald'ruhn Mages Guild. The problem is that there are 2 identical versions of this book in Morrowind_ob.esm:
FormID | EditorID | Name
011800DB | 0bkUAnnotatedAnuad | The Annotated Anuad
011800DC | 0bkUChildrensAnuad | The Annotated Anuad
If you get the wrong one, you can't turn it in for the quest. I suspect the confusion arose because there actually is a Children's Anuad in Oblivion.