It takes 33 pages if you count them when you open the "my notes" to receive the 10k reward from archeologist woman by the spring. I received most of mine from the creatures in the swamps, but also received two notes from mummies, one from lancer where the priest is and 4 from the zombies. I think which creature you receive the notes from is random. You do need the notes from the two chests in the area where the high priest is and you need to make sure he gives you his notes which are added to the book when you speak to him. I got 32 pages and then nothing would drop them so I went down and killed about 4 lancers where the high priest is and got the final one so don't give up! The reward isn't much, but you get a copy of the notes so it is possible those will be needed later on. Happy Questing, Bud