Hack This: 24 Incredible Hackerspace Projects from the DIY Movement
In the book
author John Baichtal explains what hackerspaces are and he talks about how they work and who runs them. The book also features 24 hackerspace projects from hackerspaces all around the world.
Harford Hackerspace is featured in Chapter 15: DIY CNC ROUTER.
You can purchase the book from Amazon.com