The traction engine

Rough And Tumble Engineering

James H. Maggard

1891

The modern gas tractor

Victor Wilfred Pagé

1913

Farm gas engines and tractors

Fred Rufus Jones

1932

Farm engines and tractors

Harold E. Gulvin

1953

Farm tractor maintenance

Arlen D. Brown

1958

Horse, truck and tractor

Herbert Newton Casson

1913

O.E.C.D. standard code for the official testing of small engines used in agriculture and commercial horticulture

Organisation for Economic Co-operation and Development

1970

Power for prairie plows

Grant MacEwan

1971