Blue Book Publications Blue Book Of Gun Values is the newest edition and has been expanded to over 2,300 pages, all gun values have been thoroughly updated for both modern and antique firearms, including the red hot paramilitary style guns, and it also includes new domestic and imported 2010 makes and models. Other features include the 80-page color Photo Percentage Grading System to aid in accurately determining condition of firearms and serialization and proofmark sections to help in identifying firearms. The Blue Book of Gun Values is the firearm industry's most trusted reference book with over 1.3 million copies in print