From the Publisher:
13 is your lucky number! The 13th Edition Blue Book of Acoustic Guitars is now expanded to 832 pages including a new 16-page color Photo Grading System. It also has guitar reference information and values on over 900 guitar manufacturers/distributors including Gibson, Martin, Ovation, Taylor, Alvarez, Epiphone, Takamine, Washburn, Gretsch, and Guild as well as many independent luthiers and custom builders. Other features include a database of over 3,500 acoustic guitar images available on our website, a detailed serialization section, and contact information for all current manufacturers. With over 7,000 acoustic guitars listed in the 13th Edition Blue Book of Acoustic Guitars, 13 will be your lucky number!