The Notebook is a Donator only feature which enables you to "save your notes and come back to them later." However, should you run out of donator status you will no longer have access to this feature until you renew your donator status, no information will be lost during this process you will just not be able to access what's already there.

Initially there was only one notebook, however, with a suggestion (by bogie) from the suggestions forum implemented into the game the notebook was updated to have five different notebooks, therefore enabling you to store more information over multiple notebooks.

Articles Relating to City Locations

West Side
North side
Red-Light District
City Center
East Side