Modes of Bookkeeping

At lunch, a coworker said she used to be a bookkeeper. Another coworker asked if that meant accounting. This suggested alternate ways in which one could be a bookkeeper:

The Guard

This library is a fortress of knowledge. Anyone seeking to assail these volumes must first contend with The Sword of Dewey!

The Dragon's Hoard

I shall keep these books for I have not yet read them all. If you borrow a book and do not return it, I shall raid your village!