Misroi |
Pathfinder Adventure Path Subscriber
Well, part of the problem there is that there aren't any listed spellbooks in the adventure itself. As a result, the spellbook contents are left to the DM to write up. I personally hate trying to figure out the value of a spellbook. It's a tedious task, but not a difficult one, since it's all based upon how many spells of each level are in the book.
Fortunately, someone agreed with me, and made up a calculator! You can find it here. All you have to do is enter the number of spells per level, and it calculates the rest. Easy-peasy!