I have just finished "Dewey: The small-town library cat who changed the world", too. It is a hauntingly wonderful book, though inevitably very sad at the end. As well as being the story of a remarkable cat, it is an interesting case study of a public library and its role within the community.

The library cats map is at http://www.ironfrog.com/catsmap.html. I cannot tell how recently it has been updated.