There is no Kelley Blue Book version available for tractors. However, there is a similar resource called the Tractor Blue Book, which is maintained by Price Digests member, Tractor and Grounds Maintenance.
Similar to the Kelley Blue Book for automobiles, the Tractor Blue Book allows users to search for specific years, makes and models of tractors to determine the value. This resource contains information on farm tractors manufactured from 1939 to the present. It also lets users learn about different specifications of a specific tractor.
In addition to large tractors, it contains information about other related equipment such as trimmers, mowers and recreational vehicles. As of 2014, the Tractor Blue Book has over 95,000 different models and more than 180 manufacturers in its extensive database.