The history of the tractor is one of rapid development, from the turn of the 20th century when it was a substitute for the horse, to today's sophisticated machines which boast a range of technologically advanced equipment. This fact-packed encyclopedia charts this exceptional history, the machines and their manufacturers. Each vehicle is illustrated with archive material or photography, together with specification boxes detailing engine capacity, power, transmission and weight. Including an international overview of farm machinery around the world, this volume forms a highly comprehensive tractor bible - the only book on the subject that anyone will ever need.