By the end of the twentieth century there were some half-million tractors on British farms - more machines than people to drive them. Brian Bell's encyclopaedic book traces the evolution of the farm tractor from the days of starting handle and pan seat to current 4-wheel drive machines with air-conditioned cabs and computer management systems. He deals in particular with developments of the classic period from the 1950s to the 1990s. The book is arranged...