International Harvester began building tractors in 1906. The company's earliest tractors included the Mogul and Titan. In 1924, International Harvester introduced the Farmall, the first successful all-purpose farm tractor. By 1955, the company had produced over three million tractors. The McCormick-International Harvester Collection includes engineering photographs, advertising photographs, and advertising literature documenting the development of International Harvester tractors.