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pfSense: The Definitive Guide
The Definitive Guide to the pfSense Open Source Firewall and Router Distribution
by Christopher M. Buechler and Jim Pingle

The following images are of a draft copy of the book from August 2009. This cover is designed by Holger Bauer. The photos here don't give it justice -- there is a faint red line at the top and it has a ".org" after the "pfsense".