(Guitar Book). Make every dollar count with the new 15th Edition Blue Book of Acoustic Guitars . This edition boasts 900 pages of content, including a color Photo Grading System and guitar reference information and values on over 900 guitar manufacturers/distributors including Gibson, Martin, Ovation, Taylor, Alvarez, Epiphone, Takamine, Washburn, Gretsch, and Guild. Many independent luthiers and custom builders are also represented. You'll be sure to make every dollar count when buying or selling with over 8,000 acoustic guitars listed!