The Essential Supernatural: On the Road with Sam and Dean Winchester

Title	The Essential Supernatural: On the Road with Sam and Dean Winchester
Medium	Official Companion (non-fiction), hardcover book
Creator(s)	Nicholas Knight
Publisher	Insight Editions
Release Date	December 25, 2012 October 28, 2014 (revised edition)
Link	Order from Amazon
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From the publishers:

This deluxe coffee table book dissects the show season by season, state by state, tracing the Winchester brothers as they travel across the U.S. in their distinctive ’67 Chevy Impala hunting all things that go bump in the night while seeking ways to keep humanity safe from all sorts of otherworldly threats. Illustrated with behind-the-scenes photos, exclusive production art, posters, maps, blueprints, and other elements, and packed with exclusive cast and crew interviews, plus a foreword from the show’s creator, this is the ultimate visual guide for Supernatural and its legions of fans.

A revised and updated edition was released on October 28, 2014 to coincide with the 10th season.