The story of the four-wheel-drive tractors built by Steiger, International Harvester, Case, and Case IH is told in dramatic fashion in this authoritative guide. Starting with the development of early four-wheel-drive systems at International Harvester, the book traces the evolution and design of some of the most powerful and capable tractors of the twentieth century. With fresh detail on the 4300, 4100, Steiger-built IH tractors, and the 2+2 tractors including the Super 70 series, the book offers prototype drawings of several models--including the complete story of the never-before-published Magnum 2+2-- as well as inside stories and backroom drama that is a must for any enthusiast for farm history or tractors.