Old thread, I know ...
Anama Prayer Scrolls is special item number 20. If you gave your copy to Gladwell and really need another copy later,
edit a script as suggested above, and add the following line to one of the "code" areas:
set_spec_item(20,1);
It will give you a copy of the scrolls. I edited "z100Texodusdlg.txt" for example, and added the line under the code area where you ask the guy to teach you magic.