Maps are ordered clockwise around the Bay, beginning with the Golden Gate Bridge (which is in the North Bay region).

The best way to explore the Ridge Trail is using Bay Area Ridge Trail: The Official Guide for Hikers, Mountain Bikers, and Equestrians by Jean Rusmore, published by Wilderness Press. Published in 2008, the third edition covers over 300 miles - complete with maps and detailed descriptions.  It's available in many local bookstores and outdoor retailers, or online from the publisher.