I know a lot of people want hints when it comes to completing the Lorebook. As the creator, it'd feel wrong for me to just tell you exactly where they are, so here are some clues for each book. While some books are available at various times throughout the game, they are ALL available at the end. Keep in mind, that one will only be available when all the others are completed.
1. Check the trees outside Nora's cottage
2. Do Siena a favour
3. Help reconcile Nora and Kay
4. Find a way onto the roof of the Vault
5. There is a room to the left of the Vault's entrance. What is that thing in the middle?
6. Deliver a letter, maybe!
7. Beat Marge at a game of Two-up
8. Solve the puzzle outside the Vault, make sure you keep track of how many flowers are around those statues!
9. Empty the returns box one last time
10. Find the writer of the Lorebook in her office (unlocks when all other parts are found)